Troubleshooting of computer miner

1. No display after power on
1. First of all, we conct a comprehensive inspection on the connection between the computer monitor and the host computer, and plug each connection again to see if there is any connection problem
2. If the fault still exists, we need to open the chassis to see if there are metal and other substances in the chassis, which leads to the short circuit of the computer host circuit. Then we smell the smell of the computer, see if there is the smell of burning, and see if there are damaged components around the motherboard and CPU
3. After checking the whole chassis, if the chassis is normal, we will deal with the st of the chassis
4. If the computer can't be turned on, then use the minimum system method to unplug the data cables of hard disk, floppy drive and optical drive, and then check whether the computer can be turned on. If the computer display shows the power on screen, it means that the problem lies in these devices. Then connect the above devices to the computer one by one. When connecting to a certain device, the fault reappears, indicating that the fault is caused by the device. Finally, check the device
5. If the fault still exists, it is likely to be the fault of memory card, graphics card, CPU, motherboard, etc. at this time, we just need to plug and unplug these hardware, or replace them, and try to find out the reason one by one
6. If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, connect the memory, graphics card, CPU and other devices for testing, if the computer can display, then install the motherboard into the chassis for testing until the cause of the failure is found. If the fault still exists, return the motherboard to the manufacturer for repair
7. When the computer is turned on, there is no display but an alarm sound. When the computer is turned on, the system BIOS starts to perform post (power on self-test). When a fatal error is detected in a device in the computer, it controls the loudspeaker to make a sound to report the error. Therefore, there may be no display and alarm sound when the machine is started. For the computer boot no display alarm sound fault, according to the meaning of BIOS alarm sound, to check the fault device, in order to remove the fault.

2. >& gt;& gt;& gt; 1、 Software

& gt& gt;& gt;& gt; 1. Virus damage

& gt& gt;& gt;& gt; Since the advent of computers, computer viruses have emerged as the times require. When the network becomes the information artery of today's society, the spread of the virus is more convenient, so it also interferes and destroys our normal work from time to time. A typical example is the "shockwave" virus, which has caused serious damage to computers around the world some time ago. When it breaks out, it will prompt that the system will start automatically after 60 seconds. In fact, as early as the DOS era, there are many viruses that can automatically restart your computer< br />
>& gt;& gt;& gt; For whether it belongs to virus destruction, we can use the latest version of anti-virus software for anti-virus, generally will find the existence of virus. Of course, there is also a possibility that when you surf the Internet, someone has maliciously intruded into your computer and placed a Trojan horse program. In this way, the other party can remotely control all the activities of your computer, including the restart of your computer. For some Trojans, it is not easy to clear, it is best to re install the operating system< br />
>& gt;& gt;& gt; 2. System files are damaged

& gt& gt;& gt;& gt; When the system files are damaged, such as kernel32.dll under Win2K, fonts under win98fonts directory and other basic files ring system operation are damaged, the system will be forced to restart because it cannot complete initialization ring startup. You can do an experiment, the Win98 directory font renamed try. When you turn it on again, our computer will start again and again< br />
>& gt;& gt;& gt; For this kind of failure, because you cannot access the normal desktop, you can only override the installation or re install< br />
>& gt;& gt;& gt; 3. Timing software or scheling software works

& gt& gt;& gt;& gt; If you set up to restart or load some work programs in the "schele taskbar", the computer will start again when the time comes. In this case, we can open the "start" item to check if there are any unfamiliar executive files or other timing programs in it, and then turn it on again after shielding it. Of course, we can also directly enter the "msconfig" command in "run" to select the startup item< br />
>& gt;& gt;& gt; 2、 Hardware

& gt& gt;& gt;& gt; 1. Mains voltage instability

& gt& gt;& gt;& gt; The working voltage range of switching power supply of general household computer is 170V-240V. When the mains voltage is lower than 170V, the computer will automatically restart or shut down. Because we sometimes can't feel the fluctuation of the mains voltage, we will mistakenly think that the computer will restart automatically for no reason< br />
>& gt;& gt;& gt; Solution: for areas with unstable power supply, we can purchase UPS power supply or 130-260v wide switching power supply to ensure the stable operation of the computer< br />
>& gt;& gt;& gt; 2. The quality of the plug or socket is poor and the contact is poor

& gt& gt;& gt;& gt; Most of the power plugs on the market are of poor quality. The internal contacts are welded by hand, and acid flux is often used. This will easily lead to the oxidation of solder joints in the future, causing open circuit or leakage between the live wire and the zero wire. Because of manual welding and poor elasticity of phosphor brass sheet, it is easy to lose its elasticity in a short time, resulting in poor contact with the power plug of the host or display, resulting in large contact resistance. When working for a long time, a large amount of heat will be generated, resulting in virtual connection. At this time, the host will restart or the display will flash black screen< br />
>& gt;& gt;& gt; Another possibility is the wall sockets used in our home. Most of the wall sockets are not installed by professionals, so the internal wiring of the sockets is very nonstandard. Especially, if we often use high-power electric heaters, it is easy to cause internal heating, oxidation, virtual connection and intermittent power failure, Causes the computer to restart or the monitor blinks< br />
>& gt;& gt;& gt; Solution:

& gt& gt;& gt;& gt; ① Don't try to save money and buy cheap and low-quality power plug-ins. Buy some famous brand power plug-ins, because the internal parts are automatically installed and crimped by machines, and manual welding is not used< br />
>& gt;& gt;& gt; ② For whether it belongs to the problem of virtual connection inside the wall socket, we can try to replace the host with a wall socket to see if there is the same problem of automatic restart< br />
>& gt;& gt;& gt; 3. Insufficient power or poor performance of computer power supply

& gt& gt;& gt;& gt; This kind of situation is also quite common, especially when we add new equipment for our host computer, such as replacing high-end graphics card, adding recorder, adding hard disk, it is easy to appear. When the host is working at full speed, such as running a large-scale 3D game, recording at high speed or preparing to read the CD, when it is just started, the double hard disks the data, which may cause the power protection to stop output e to the lack of instantaneous power supply. However, when the power supply stops output, the load will be reced, and then the power supply will start again. Because the recovery time after protection is very short, our performance is that the host restarts automatically< br />
>& gt;& gt;& gt; Another case is that the performance of the host switching power supply is poor, although the voltage is stable and within the normal allowable range, but because the harmonic content in the output power supply is too large, it will also cause the host to crash or restart frequently. For this case, we use a multimeter to test its voltage is normal, it is best to replace a good power supply to replace the exclusion< br />
>& gt;& gt;& gt; Solution: high quality and high power computer power supply< br />
>& gt;& gt;& gt; 4. The mains plug of the host switching power supply is loose and in poor contact, and it is not tightly inserted

& gt& gt;& gt;& gt; This kind of situation, most will appear in DIY machine, the power cord of the host power supply has not passed 3C certification, and does not match the power socket. When we shake the table or touch the host, the host will restart automatically, usually accompanied by a slight electric fire< br />
>& gt;& gt;& gt; Solution: replace high quality 3C certified power cord< br />
>& gt;& gt;& gt; 5. The atx20 socket of the power supply of the main board has false soldering and poor contact

& gt& gt;& gt;& gt; This kind of fault is not common, but it does exist, mainly when the host is working normally, move the atx20 pin plug left and right to see if the host will restart automatically. At the same time, check whether the spring inside the 20 pin power plug is oxidized, which can easily lead to high contact resistance and poor contact, causing the host machine to crash or restart. Sometimes it is necessary to check whether the connecting wires at the tail of 20 pin plug are reliable< br />
>& gt;& gt;& gt; Solution:

& gt& gt;& gt;& gt; ① If it is the motherboard solder joint, direct repair welding with electric iron is OK. Note: when welding motherboard, hard disk, graphics card and other computer boards, make sure the electric iron is well grounded, or pull out the power plug when welding< br />
>& gt;& gt;& gt; ② If it's a power problem, it's better to replace a good power supply< br />
>& gt;& gt;& gt; 6. CPU problems

& gt& gt;& gt;& gt; When some function circuits of CPU are damaged and the secondary cache is damaged, the computer can start, and even enter the normal desktop for normal operation. But when a special function is performed, it will restart or crash, such as drawing tables, playing VCD, playing games, etc< br />
>& gt;& gt;& gt; Solution: try to mask L2 or L1 in CMOS to see if the host can run normally; Another way is to replace and eliminate the CPU directly. If the shielding can work normally, you can still make do with it. Although it is slower, it will save money< br />
>& gt;& gt;& gt; 7. Memory problems

& gt& gt;& gt;& gt; If a chip on the memory mole is not completely damaged, it is likely to pass the self-test (most of them are set with post), but it will restart unexpectedly e to the function failure caused by the high heat of the memory. Most of the time, when the memory is damaged, the boot will give an alarm, but when the memory is damaged, it will not give an alarm, and there are still some faults without power on. It is better to use the elimination method, which can quickly determine the fault location< br />
>& gt;& gt;& gt; 8. Optical drive problems

& gt& gt;& gt;& gt; If the CD-ROM drive is damaged internally, it will also cause the host to start slowly or fail the self-test, or it may restart suddenly in the process of working. For the latter case, if we replace the optical drive, it is likely that the power consumption of the optical drive is different. What you need to understand is that although the ATPI interface of the optical drive is the same, the pin definitions of different manufacturers are not the same. If there is a problem with our hard disk cable, there may be a situation that there is no problem with the use of a certain brand of optical drive, but there is no problem with the use of other brands of optical drives. This needs your attention< br />
>& gt;& gt;& gt; 9. Reset key quality problem

& gt& gt;& gt;& gt; If the reset switch is damaged and the internal reed is always in the position of short circuit, the host will not be able to power up for self-test. However, when the elasticity of the reset switch is weakened or the button on the chassis is not easy to pop up when it is pressed down, it will appear in the process of use, because the chassis is touched occasionally or the host suddenly restarts in normal use. Therefore, when the reset switch can't be pressed freely, we must check it carefully. It's better to replace a new reset button switch or lubricate the external buttons of the chassis< br />
>& gt;& gt;& gt; Another case is that the insulation layer of reset switch lead in the chassis is stripped too much ring welding, and the reset switch lead is too close to each other e to multiple unpacking ring use, resulting in collision and automatic restart of the host< br />
>& gt;& gt;& gt; 10. Auto restart when accessing network card or parallel port, serial port, USB interface to external device

& gt& gt;& gt;& gt; This situation is generally e to peripheral failure, such as printer parallel port damage, a pin short circuit to the ground, USB device damage short circuit to the ground, network card work is not standard, when we use these devices, will cause the computer to restart because of a sudden power short circuit< br />
>& gt;& gt;& gt; 3、 Other reasons

& gt& gt;& gt;& gt; 1. Poor heat dissipation or temperature measurement failure

& gt& gt;& gt;& gt; CPU heat dissipation is poor. The common problems are that the fixing clip of CPU radiator falls off, there are foreign matters between CPU radiator and CPU, and there is too much st on CPU radiator after long-time use of CPU fan. All of these will lead to poor heat dissipation of CPU, high accumulated temperature and automatic restart< br />
>& gt;& gt;& gt; Another problem is that the temperature probe under the CPU is damaged, or the temperature measuring circuit inside the p4cpu is damaged, and the BIOS on the motherboard has a bug. Under certain special conditions, the temperature measurement is not accurate, which will cause the host to restart automatically and protectively< br />
>& gt;& gt;& gt; Finally, if the CPU protection temperature set in CMOS is too low, the host will restart automatically< br />
>& gt;& gt;& gt; 2. Fan speed measurement failure

& gt& gt;& gt;& gt; When the speed measuring circuit of CPU fan is damaged or the speed measuring line is damaged

3. Since it's a common computer fault, it means that it's a small fault. You just need to shut down and restart it

4. 1、 How to detect computer fault in teaching mm how to remove the fault before, of course, we must learn how to detect the fault. If it's like the outside computer city detection method, usually there will be a dbug card or professional software to detect the fault, this method is very intuitive, you can find the problem. But the dbug card or professional detection software, there is a certain degree of difficulty in operation, mm are difficult to understand the principle, so these two fastest and most straightforward troubleshooting methods, are not suitable for mm. Therefore, we introce some simple and easy to understand methods here, so that MM can also find the root cause of the fault in a more sure situation. The methods we introced are relatively "primitive", which can be said to have little technical content, so mm should be easy to master. The first is "look, listen, touch and smell". This is a practical method, but only typical or obvious faults can be found“ "See" is to observe whether the computer has sparks, whether the power line or data line is loose, whether there is a broken line or touch line, etc. these problems can cause very intuitive small faults, such as the CD-ROM drive can not start, the hard disk can not enter the system, or can not start“ "Listen" is to listen to the sound of computer accessories, including the alarm sound and the strange sound of indivial hardware, which can eliminate the common problems such as loose memory and bad hard disk“ "Touch" is to directly touch the components on the motherboard, such as electrode tubes, capacitors and CPU fans, to see if they are loose, or if they are often hot. In case of such problems, they usually need to be repaired and replaced“ "Smell" is very simple, that is, directly smell the smell of the computer. If there is a scorching smell, it will prove that a component or accessory is burnt out. Take it out and replace it directly. The second method is also very stupid, but it needs to use hands-on ability, that is "exchange plug method"“ "Exchange plug method" refers to the replacement of a certain accessory with the normal running accessory of other machines, and the detection of the faulty accessory by comparison. I believe that many young students have used this method, but there are some limitations. First, it's not so easy to get the normal running parts of other machines, because you don't have to be borrowed; Second, the accessories of other machines may not be compatible with your computer. This usually occurs on older computers, so the problems found may not be the real problems. In a word, the two methods introced above are our common and relatively simple troubleshooting methods. Mm can learn from these two methods and find out the fault problems by themselves. Typical or obvious faults can be found out, so that they can prescribe medicine for the disease. 2、 What's the problem with the strange noise? Computer soft fault is a problem that girls often encounter. The stupid way is to follow the system again. And computer hardware failure, in the end often encounter those problems? Above describes the detection of computer failure method, now of course is to MM how to deal with the computer often encountered failure. It's easy for people to move computers home ring holidays. It's a long way home, and it's hard to avoid bumps. It's easy to make the parts loose or even break down. Old machine or moved machine, often repaired and installed, will make some strange noise, mm encountered such a situation, will be in a hurry, do not know how to do. In fact, most of these failures are relatively easy to solve. The first cause of boot barking may be poor memory contact, which is also a common fault often encountered in moving or old machines. The characteristic is that there will be a long and short alarm sound constantly ringing. The solution is very simple, is to remove the memory, re install once can solve the problem. If it is an old machine, you should also use an eraser to wipe the copper part of the memory, because after using for a long time, the copper part may be oxidized, which will also cause poor contact. When inserting the memory, you should pay attention to: first, the gap of the memory should be aligned with the convex block of the memory slot, and then press it down with vertical force. When you hear a "click", the plastic bayonet of the memory slot will close automatically. The memory is easy to oxidize, and the second place that makes a strange noise is probably the hard disk. At the first opportunity, you can hear the harsh sound of "Zizi", which may be the cause of bad roads on the hard disk. It's also very simple to judge whether it is a problem. As long as you run the disk scan option of the system tool in the attachment, XP does not include this function in the attachment. You just right-click the disk - properties - tool process, and you can see the error checking option. If it runs, it can have the same function as disk scan. If from the scan report, you can detect whether your hard disk has bad tracks. If there is a bad way, mm can only turn to experts for help or directly replace the hard disk. There is another situation, which is not a fault, but it is also likely to cause the fault, that is, the sound of CPU or graphics card cooling fan. Most of this is caused by too much st or poor operation of the bearing. You just need to clean up the st and add some oil to the cooling fan to basically solve this problem. If it can't be solved, it's time to ask someone to replace the cooling fan. There's more in the back http://www.cpcw.com/disp.php?aid=5986&cid=13&pg=2

5. Basically, I said it on the second floor, but I should also pay attention to protect my computer.

6. 1、 Fault type: no output of power supply
this type is the most common fault, which mainly shows that the power supply does not work. When the host computer confirms that the power cord has been connected (some power supply with AC switch needs to be turned on), there is no response when the power is turned on, and the display does not display (the indicator light of the display flashes). No output fault can be divided into the following categories:

① + 5VSB has no output

as mentioned above, + 5VSB should have normal 5V output when the host power is connected to AC, and supply power for the starting circuit of the main board. Therefore, + 5VSB no output, motherboard start circuit can not act, will not be able to boot

the method of making this fault is: remove the power supply from the host, connect the AC input line of the host power supply, and use a multimeter to measure the voltage of the purple line (+ 5VSB) in the 20 core plug of the power supply output to the motherboard. If there is no output voltage, it means that the + 5VSB line is damaged and the power supply needs to be replaced. For some motherboards with standby indicator, when there is no multimeter, you can also use the indicator to judge whether the + 5VSB has output. This kind of fault shows that there is damage in the power supply, and the fuse is likely to be blown

② + 5VSB has output, but the main power supply has no output

in this case, the standby indicator is on, but there is no response after pressing the power on key, and the power supply fan does not move. This phenomenon indicates that the fuse is not broken, but the main power supply is not working. The fault diagnosis method is as follows: remove the power supply from the host, short circuit the 20 core medium green line (pson / off) to the ground or connect a small resistance to the ground, so that the voltage is below 0.8V. At this time, the power supply still has no output and the fan does not rotate, except in this case, the main power supply has been damaged and needs to be replaced< (3) the + 5VSB has output, but the main power supply protection is also common, which can be caused by manufacturing process or early failure of devices. The difference between this phenomenon and ② is that the fan will shake when starting up, that is, the power supply has output, but it is protected e to fault or external factors. In order to eliminate the damage and short circuit caused by the power load (motherboard, etc.) or other factors, the power supply can be removed from the host, and the 20 core medium green line can be short circuited to the ground. If the power output is normal, it may be:

I. the power supply protection is caused by the damage of the power load, and the damaged power load shall be replaced

II. The protection is caused by the internal abnormality of the power supply, so the power supply needs to be replaced

III. poor compatibility between power supply and load leads to protection under certain load, which needs further analysis

4. The power supply is normal, but the main board does not give the power on signal

in this case, the power supply has no output. The multimeter can be used to measure whether the voltage of the 20 core medium green line to ground drops below 0.8V after the main machine is turned on. If it does not drop or is not below 0.8V, the power supply may not turn on< 2. Fault type

the power supply has output, but the host does not display. Tips: this situation is complex and difficult to judge, but it can be considered from the following aspects:

1) if one or more output voltages of the power supply are abnormal, it can be tested with a multimeter

2) there is no P.G signal, that is, whether the gray line in the 20 core wire is high level is measured. If it is low level, the host will always be in the reset state and cannot be started

3) the rising edge of power output or abnormal timing, or poor compatibility with the motherboard, can also cause the host not to display, but this situation is more complex, need to use the storage oscilloscope to analyze.

7. Examples of computer common fault maintenance
1. Computer alarm fault
the following two common BIOS chips (AMI BIOS and award BIOS) are taken as examples to introce the specific meaning of common post ring Codes:
award BIOS
1short: the system starts normally, indicating that there is no problem with the machine.
2short: conventional CMOS setting error, please enter CMOS setup, Reset the incorrect option.
1leng1short: memory or motherboard error. Try changing a memory or memory slot, if it still can't, you have to replace the motherboard.
1leng2short: display or display card error, re plug the graphics card or check the display wiring.
1leng3short: keyboard controller error, check motherboard to see if the keyboard pin is crooked or broken, If there is no problem with the keyboard, it is the problem with the PS / 2 interface of the motherboard.
1 long and 9 short: the flash RAM or EPROM of the motherboard is wrong, and the BIOS is damaged. Try changing the flash RAM.
keep ringing (long voice): the memory mole is not tightly inserted or damaged. Re insert the memory mole, or replace the internal memory. It may also be caused by poor contact of the graphics card or useless graphics card, Try to plug in or replace the graphics card again.
AMI BIOS
1 short: memory refresh failed. Replace the memory mole or memory slot.
2 short: memory ECC check error. Set the memory ECC check option to disabled in CMOS setup, However, the most fundamental solution is to replace a memory.
3 short: system basic memory check fails. Change memory or memory slot.
4 short: system clock error.
5 short: CPU error.
6 short: keyboard controller error.
7 short: system real mode error, unable to switch to protection mode.
8 short: display memory error. Display memory problem, Try to replace the graphics card.
9 short: BIOS chip check and error.
1 long 3 short: memory error or memory damage, replace the memory or replace the memory slot.
1 long 8 short: display test error. The display data cable is not plugged in well or the display card is not plugged in firmly. Re plugging should be able to solve the problem.
the general motherboard uses one of the above two BIOS chips, If you don't modify the CMOS information deliberately, most of the common faults are loose parts. Therefore, the solution is to replace parts or plug in and plug out.
2. Faults that can't be started normally

case 1: when the computer starts up, it makes a long or short sound, and the display goes black.
solution: after the computer is shut down, plug in the AGP display card tightly, Keep vertical with the motherboard as much as possible.
tips: the computer must be placed in a stable place, and try to avoid shaking the computer (especially when the computer is working normally). Most of the computer hardware failures are caused by poor contact between the hardware, which we must pay attention to< Case 2: when the computer starts up, the screen is black, the power light of the chassis is normal, and the machine doesn't sound a prompt.
solution: check the hardware with the replacement method, and the results are all normal. Finally, it is found that the reset key is slightly depressed and gently pulled up, and the fault is solved.
prompt: now some chassis are rough, especially the fake and shoddy procts, so you should see clearly when you purchase.
case 3: after modifying the BIOS of a computer, the, Black screen.
solution: turn off the power, cut off the power, and clear the CMOS jumper. Generally, it is near the CMOS battery of the motherboard, and its default position is 1,2 short circuit. As long as it jumps to 2,3 short circuit, and then plug it back in, the fault is solved.
prompt: clearing BIOS does not mean that the BIOS content is cleared, but that some artificially set options are cleared, Friends who like overclocking often encounter this kind of situation.
situation 4: a computer often has a black screen for no reason.
solution: ring maintenance, it is found that everything is normal after the chassis is placed flat. After careful observation, it is found that the CPU fan is normal when the chassis is placed flat, and the fan rotation resistance increases e to the influence of gravity when the chassis is placed vertically, which causes the fan to stop, the CPU temperature rises suddenly, causing the black screen to crash, Prompt: a fan with good performance is the guarantee of the normal operation of the system, so it's better to use a fan with speed inction to prevent accidents. If the motherboard has a monitoring and management program, it must be installed.
case 5: a computer with kt133 motherboard often fails to pass the self checking memory, It's no use clearing BIOS and setting default.
solution: check the settings in BIOS and find that this motherboard uses the SPD information of read memory to determine the memory speed. Set the DRAM clock to 100MHz in BIOS and everything is normal.
prompt: kt133 has the memory out of step function, that is, the memory speed can be inconsistent with the motherboard bus speed, There is & quot; in BIOS settings; Host-Clock"( Bus frequency synchronization), & quot; HCLK-33MHz"( Bus frequency minus 33MHz), & quot; HCLK+33MHz"( But the default of kt133 motherboard is & quot; Host-Clock"( However, the SPD information of many miscellaneous memory moles is not the same as the chip speed, which leads to the failure when the computer starts up.
case 6: a computer crashes when it self checks the newly purchased 30GB hard disk, and the hard disk itself has no problem.
solution: change the hard disk mode from normal to LBA or auto in BIOS, and the problem is solved.
prompt: there are three working modes of the hard disk: normal, If your hard disk is larger than 528mb, please set its working mode to LBA in BIOS. If it is set to other modes, there will be errors when reading and writing the hard disk, and even cause the data loss of the hard disk.
case 7: when you boot up, the key board error will be displayed.
solution: plug or replace the keyboard again, Or skip the step of keyboard detection to start (set halt on to no errors in BIOS)
prompt: in & quot; STANDARD CMOS SETUP"( The default setting is all errors, which means that any error in the post (power on self test) process will stop starting. This selection can ensure the stability of the system. If you want to speed up, you can set it to no errors, that is, you can start at any time, However, this may cause system errors.
case 8: when starting, the windows registry is often damaged for no reason, prompting the user to recover and automatically enter the safe mode when Windows starts.
solution: replace the miscellaneous memory with a brand memory, and the failure is removed.
prompt: the quality of the memory moles on the market is uneven, and the stability is not guaranteed, If you don't have the experience of identification, you'd better buy brand memory.
well, I've talked about so many startup failures and solutions, hoping to give you some inspiration
3. Solve the problem of XP shutdown but restart.
there may be the following reasons for the failure:
system settings
by default, Windows XP will automatically restart when there is an error in the system, so that when the user shuts down, the system will automatically restart, If the system fails in the process of shutdown, it will restart the computer. Turning this function off can often solve the problem of automatic restart.
right click & quot; on the desktop; My computer;, Select & quot; Properties & quot;, Pop up & quot; System attribute & quot; Window, click & quot; Advanced & quot; Tab, click & quot; Startup and fault recovery & quot; & quot; Set & quot; Button, pop up & quot; Startup and fault recovery & quot; Window. In & quot; System failure & quot; In the column & quot; Auto restart & quot; Remove the check before the option and click & quot; Determine & quot; Button.
advanced power management
as we all know, shutdown is closely related to power management, and the cause of shutdown failure is probably caused by poor support of power management for the system.
Click & quot; Start → setup → control panel → performance and maintenance → power options;, In the pop-up window, enable or cancel & quot; Advanced power support & quot; OK. If you use enable & quot; when the fault occurs; Advanced power support;, Try to cancel it if you use cancel & quot; when the fault occurs; Advanced power support & quot; If you try to enable it, the fault will be solved easily.
4. When you decompress the file and install the system, you will be prompted & quot; An error occurred while decompressing the file. A file could not be extracted correctly; This kind of failure is common in the process of installing the system, and it often exits the installation unexpectedly. In fact, it is often caused by poor quality or poor stability of the memory. Most problems can occur after replacing the memory.
this kind of problem will appear the same prompt message whether it is installed directly from the CD or from the hard disk, If a file cannot be read normally in Win2K and XP process, please select & quot; Ignore, terminate, abandon;, But most of those problems are caused by the poor quality of the optical disk or the long-time use of the optical disk drive, and the decline of the disk reading performance. At the same time, the light of the optical disk drive will flash slowly, accompanied by the & quot; Hua Hua & quot;
if my computer has this kind of fault, you can directly replace the memory, and then see if the same fault still occurs. If the fault disappears, it means that there is a problem with the original memory; If the fault persists, it is mostly caused by the poor quality of the CD or the decline of the CD-ROM drive, or the damage of the system installation files on the hard disk.
5. The blue screen or the system can not be installed normally, the system is unstable e to the memory damage, and the blue screen or the system can not be installed normally, There are always irregular prompt file reading or decompression errors, memory damage leads to unstable system operation, often blue screen or unable to install the system smoothly, and there are always irregular prompt file reading or decompression errors.
for such problems, we should first eliminate the software problems. First, backup the important data of Disk C, and then use & quot; format C:/u /c /s" Command to force the C disk to be fully formatted, and carefully observe the formatting process, whether the format is smooth, and whether the hard disk has bad tracks. Because bad tracks on the hard disk will damage the system files, causing the system to run unstable and easy to crash. Second, re install the operating system, and pay attention to observe whether there are errors such as the file cannot be opened and the file cannot be found ring the installation process, Basically, it means that there is no problem with the hardware.
the system is unstable and prone to crash. It is very likely that the system has been used for a long time without regular disk scanning and defragmentation, resulting in excessive loss or damage of the system files, which makes the system unable to work normally and stably, Replace and eliminate the memory and CPU. When the fault remains after the replacement of the CPU and memory, the motherboard must be replaced for inspection.
6. Frequent restart and abnormal operation
memory damage leads to frequent restart and abnormal operation of the computer. It is also the case that we encounter more memory faults. For such faults, we can directly replace the memory, If the fault is still present, you can directly judge whether it is a memory fault. If the fault is still present, you need to re install the operating system to check whether it is caused by the system. There are many reasons for computer auto restart, and the most common one is insufficient power supply, It's easy to restart automatically. Another problem is that the voltage is unstable, the range of change is too large, or the power socket is not in good contact, which can also cause the computer to restart automatically. Therefore, after this kind of failure, we can't blindly focus on one kind of accessory to find the problem,
7, When we use the computer is a sudden power failure, restart can detect the hard disk, but not

8. The possible causes and solutions of computer auto restart

& gt& gt;& gt;& gt; 1、 Software

& gt& gt;& gt;& gt; 1. Virus damage

& gt& gt;& gt;& gt; Since the advent of computers, computer viruses have emerged as the times require. When the network becomes the information artery of today's society, the spread of the virus is more convenient, so it also interferes and destroys our normal work from time to time. A typical example is the "shockwave" virus, which has caused serious damage to computers around the world some time ago. When it breaks out, it will prompt that the system will start automatically after 60 seconds. In fact, as early as the DOS era, there are many viruses that can automatically restart your computer< br />
>& gt;& gt;& gt; For whether it belongs to virus destruction, we can use the latest version of anti-virus software for anti-virus, generally will find the existence of virus. Of course, there is also a possibility that when you surf the Internet, someone has maliciously intruded into your computer and placed a Trojan horse program. In this way, the other party can remotely control all the activities of your computer, including the restart of your computer. For some Trojans, it is not easy to clear, it is best to re install the operating system< br />
>& gt;& gt;& gt; 2. System files are damaged

& gt& gt;& gt;& gt; When the system files are damaged, such as kernel32.dll under Win2K, fonts under win98fonts directory and other basic files ring system operation are damaged, the system will be forced to restart because it cannot complete initialization ring startup. You can do an experiment, the Win98 directory font renamed try. When you turn it on again, our computer will start again and again< br />
>& gt;& gt;& gt; For this kind of failure, because you cannot access the normal desktop, you can only override the installation or re install< br />
>& gt;& gt;& gt; 3. Timing software or scheling software works

& gt& gt;& gt;& gt; If you set up to restart or load some work programs in the "schele taskbar", the computer will start again when the time comes. In this case, we can open the "start" item to check if there are any unfamiliar executive files or other timing programs in it, and then turn it on again after shielding it. Of course, we can also directly enter the "msconfig" command in "run" to select the startup item< br />
>& gt;& gt;& gt; 2、 Hardware

& gt& gt;& gt;& gt; 1. Mains voltage instability

& gt& gt;& gt;& gt; The working voltage range of switching power supply of general household computer is 170V-240V. When the mains voltage is lower than 170V, the computer will automatically restart or shut down. Because we sometimes can't feel the fluctuation of the mains voltage, we will mistakenly think that the computer will restart automatically for no reason< br />
>& gt;& gt;& gt; Solution: for areas with unstable power supply, we can purchase UPS power supply or 130-260v wide switching power supply to ensure the stable operation of the computer< br />
>& gt;& gt;& gt; 2. The quality of the plug or socket is poor and the contact is poor

& gt& gt;& gt;& gt; Most of the power plugs on the market are of poor quality. The internal contacts are welded by hand, and acid flux is often used. This will easily lead to the oxidation of solder joints in the future, causing open circuit or leakage between the live wire and the zero wire. Because of manual welding and poor elasticity of phosphor brass sheet, it is easy to lose its elasticity in a short time, resulting in poor contact with the power plug of the host or display, resulting in large contact resistance. When working for a long time, a large amount of heat will be generated, resulting in virtual connection. At this time, the host will restart or the display will flash black screen< br />
>& gt;& gt;& gt; Another possibility is the wall sockets used in our home. Most of the wall sockets are not installed by professionals, so the internal wiring of the sockets is very nonstandard. Especially, if we often use high-power electric heaters, it is easy to cause internal heating, oxidation, virtual connection and intermittent power failure, Causes the computer to restart or the monitor blinks< br />
>& gt;& gt;& gt; Solution:

& gt& gt;& gt;& gt; ① Don't try to save money and buy cheap and low-quality power plug-ins. Buy some famous brand power plug-ins, because the internal parts are automatically installed and crimped by machines, and manual welding is not used< br />
>& gt;& gt;& gt; ② For whether it belongs to the problem of virtual connection inside the wall socket, we can try to replace the host with a wall socket to see if there is the same problem of automatic restart< br />
>& gt;& gt;& gt; 3. Insufficient power or poor performance of computer power supply

& gt& gt;& gt;& gt; This kind of situation is also quite common, especially when we add new equipment for our host computer, such as replacing high-end graphics card, adding recorder, adding hard disk, it is easy to appear. When the host is working at full speed, such as running a large-scale 3D game, recording at high speed or preparing to read the CD, when it is just started, the double hard disks the data, which may cause the power protection to stop output e to the lack of instantaneous power supply. However, when the power supply stops output, the load will be reced, and then the power supply will start again. Because the recovery time after protection is very short, our performance is that the host restarts automatically< br />
>& gt;& gt;& gt; Another case is that the performance of the host switching power supply is poor, although the voltage is stable and within the normal allowable range, but because the harmonic content in the output power supply is too large, it will also cause the host to crash or restart frequently. For this case, we use a multimeter to test its voltage is normal, it is best to replace a good power supply to replace the exclusion< br />
>& gt;& gt;& gt; Solution: high quality and high power computer power supply< br />
>& gt;& gt;& gt; 4. The mains plug of the host switching power supply is loose and in poor contact, and it is not tightly inserted

& gt& gt;& gt;& gt; This kind of situation, most will appear in DIY machine, the power cord of the host power supply has not passed 3C certification, and does not match the power socket. When we shake the table or touch the host, the host will restart automatically, usually accompanied by a slight electric fire< br />
>& gt;& gt;& gt; Solution: replace high quality 3C certified power cord< br />
>& gt;& gt;& gt; 5. The atx20 socket of the power supply of the main board has false soldering and poor contact

& gt& gt;& gt;& gt; This kind of fault is not common, but it does exist, mainly when the host is working normally, move the atx20 pin plug left and right to see if the host will restart automatically. At the same time, check whether the spring inside the 20 pin power plug is oxidized, which can easily lead to high contact resistance and poor contact, causing the host machine to crash or restart. Sometimes it is necessary to check whether the connecting wires at the tail of 20 pin plug are reliable< br />
>& gt;& gt;& gt; Solution:

& gt& gt;& gt;& gt; ① If it is the motherboard solder joint, direct repair welding with electric iron is OK. Note: when welding motherboard, hard disk, graphics card and other computer boards, make sure the electric iron is well grounded, or pull out the power plug when welding< br />
>& gt;& gt;& gt; ② If it's a power problem, it's better to replace a good power supply< br />
>& gt;& gt;& gt; 6. CPU problems

& gt& gt;& gt;& gt; When some function circuits of CPU are damaged and the secondary cache is damaged, the computer can start, and even enter the normal desktop for normal operation. But when a special function is performed, it will restart or crash, such as drawing tables, playing VCD, playing games, etc< br />
>& gt;& gt;& gt; Solution: try to mask L2 or L1 in CMOS to see if the host can run normally; Another way is to replace and eliminate the CPU directly. If the shielding can work normally, you can still make do with it. Although it is slower, it will save money< br />
>& gt;& gt;& gt; 7. Memory problems

& gt& gt;& gt;& gt; If a chip on the memory mole is not completely damaged, it is likely to pass the self-test (most of them are set with post), but it will restart unexpectedly e to the function failure caused by the high heat of the memory. Most of the time, when the memory is damaged, the boot will give an alarm, but when the memory is damaged, it will not give an alarm, and there are still some faults without power on. It is better to use the elimination method, which can quickly determine the fault location< br />
>& gt;& gt;& gt; 8. Optical drive problems

& gt& gt;& gt;& gt; If the CD-ROM drive is damaged internally, it will also cause the host to start slowly or fail the self-test, or it may restart suddenly in the process of working. For the latter case, if we replace the optical drive, it is likely that the power consumption of the optical drive is different. What you need to understand is that although the ATPI interface of the optical drive is the same, the pin definitions of different manufacturers are not the same. If there is a problem with our hard disk cable, there may be a situation that there is no problem with the use of a certain brand of optical drive, but there is no problem with the use of other brands of optical drives. This needs your attention< br />
>& gt;& gt;& gt; 9. Reset key quality problem

& gt& gt;& gt;& gt; If the reset switch is damaged and the internal reed is always in the position of short circuit, the host will not be able to power up for self-test. However, when the elasticity of the reset switch is weakened or the button on the chassis is not easy to pop up when it is pressed down, it will appear in the process of use, because the chassis is touched occasionally or the host suddenly restarts in normal use. Therefore, when the reset switch can't be pressed freely, we must check it carefully. It's better to replace a new reset button switch or lubricate the external buttons of the chassis< br />
>& gt;& gt;& gt; Another case is that the insulation layer of reset switch lead in the chassis is stripped too much ring welding, and the reset switch lead is too close to each other e to multiple unpacking ring use, resulting in collision and automatic restart of the host< br />
>& gt;& gt;& gt; 10. Auto restart when accessing network card or parallel port, serial port, USB interface to external device

& gt& gt;& gt;& gt; This situation is generally e to peripheral failure, such as printer parallel port damage, a pin short circuit to the ground, USB device damage short circuit to the ground, network card work is not standard, when we use these devices, will cause the computer to restart because of a sudden power short circuit< br />
>& gt;& gt;& gt; 3、 Other reasons

& gt& gt;& gt;& gt; 1. Poor heat dissipation or temperature measurement failure

& gt& gt;& gt;& gt; CPU heat dissipation is poor. The common problems are that the fixing clip of CPU radiator falls off, there are foreign matters between CPU radiator and CPU, and there is too much st on CPU radiator after long-time use of CPU fan. All of these will lead to poor heat dissipation of CPU, high accumulated temperature and automatic restart< br />
>& gt;& gt;& gt; Another problem is that the temperature probe under the CPU is damaged, or the temperature measuring circuit inside the p4cpu is damaged, and the BIOS on the motherboard has a bug. Under certain special conditions, the temperature measurement is not accurate, which will cause the host to restart automatically and protectively< br />
>& gt;& gt;& gt; Finally, if the CPU protection temperature set in CMOS is too low, the host will restart automatically< br />
>& gt;& gt;& gt; 2. Fan speed measurement failure

& G

9. Dynamic shutdown

phenomenon: when the computer is in normal operation, it suddenly automatically shut down or restart the system

phenomenon analysis: today's motherboard has a temperature monitoring function for CPU. Once the CPU temperature is too high and exceeds the temperature set in the BIOS of the motherboard, the motherboard will automatically cut off the power supply to protect the relevant hardware. On the other hand, the power management and virus software in the system will also lead to this phenomenon

what should be done: if the above sudden shutdown phenomenon occurs all the time, first confirm whether the CPU heat dissipation is normal. Boot box visually check whether the fan blades work normally, and then enter the BIOS option to see the fan speed and CPU working temperature. If it is found that the problem is the fan, carry out relevant st removal maintenance or replace the fan with better quality. If you exclude the hardware reasons, enter the system, from the "kiss to death" installation CD-ROM to cover the installation of power management, and then thoroughly kill the virus. When these factors are eliminated, the cause of the failure may be the aging or damage of the power supply, which can be confirmed by replacing the power supply. If the power supply breaks down, replace it with a new one. Do not continue to use it. It will burn the hardware

system down

phenomenon: the desktop is locked, the mouse can't move, and even the hot start (ALT + Ctrl + Del) can't work in serious cases. There is also the blue screen phenomenon

phenomenon analysis: the bug of "kiss to death" system itself and the compatibility problem between various software are the causes of the failure, or the user may run too many large programs at the same time, which leads to process blocking and crash<

countermeasures: there are two kinds of machine crashes, true and false. The simplest way to distinguish the two is to press the NumLock key in the keypad area and observe whether the indicator light changes. If there is, it will be false; On the contrary, it should be. If you can press Alt + Ctrl + Del at the same time, select the program name in the task list and mark the item that has no response, then click end task. Really, only cold start. For the blue screen, after pressing the ESC key is invalid, select restart and press the reset key on the chassis panel. For compatibility problems, you can uninstall the "problem" software and update the motherboard BIOS and related motherboard drivers<

virus attack

phenomenon: the system runs slowly, crashes, illegal operation, hard disk lights flicker, often blue screen, and inexplicable system prompts...

phenomenon analysis: the virus is essentially a kind of malicious computer program code. Through a large number of self replication, the virus runs secretly in the system and occupies system resources, Serious will also cause damage to software and hardware, such as CIH, hard disk lock, etc

countermeasures: the road is higher, the devil is lower, and the killer of virus is antivirus software. Once you suspect that your machine is infected with a virus, please restart the system to dos and run the genuine anti-virus software (DOS version), so that you can kill the virus that you can't kill under the "kiss to death"; And then start to the system desktop, run the Windows version of antivirus software for re antivirus. On the other hand, some files will be destroyed when the virus attacks seriously; Before the outbreak of the virus, we backup the important files to other drives other than disk C, and set the attribute of the data file as read-only. At the same time, we should always update the antivirus software virus library, use less pirated discs, friends who have been online should not download unknown email attachments

system fault

phenomenon: unable to enter the system, typical performance is that the boot self-test passes, stops at the boot screen, or displays the disk is error and many other phenomena with E-TEXT prompt

phenomenon analysis: This is a system failure, which can be caused by many reasons. The more common is that the system file is modified, damaged, or the abnormal command line is loaded. In addition, the failure of hard disk is also one of the reasons

countermeasures: first of all, try whether you can enter the safe mode, press the F8 key when you start the machine, and select the third item in the Startup menu: safe model. After entering the security mode, you can find the fault through the device manager and system file checker, and encounter the "!" You can find out whether del or interrupt is set. You can also reload the driver. If the system file is damaged, you can recover it from the installation file (it is recommended to the windows installation disk in the hard disk in advance). If you can't even enter the safe mode, you can boot to DOS through the CD or floppy disk with boot. In DOS, you should first kill the virus and use dir to check whether the system files in Disk C are complete. If necessary, you can restore the relevant basic system files by sysc: on the system floppy disk. If no file is found in Disk C, the system must be completely reinstalled

driver lost

phenomenon: 16 color display when power on, and "XXX" device is occupied when playing audio file

phenomenon analysis: after eliminating the cause of the virus, this phenomenon often occurs on the old computer that has been used for n months, or the user has recently moved the components in the host computer (such as graphics card and PCI card), which may cause poor contact of the hardware, resulting in that the system does not detect the relevant hardware thoroughly

countermeasures: re install the driver of the graphics card, and check whether the relevant accessories are in full contact with the motherboard: first, keep the gold finger of the graphics card and sound card clean; second, insert it into the relevant slot with proper force, align it vertically, and then connect it with the matching speaker and monitor. If necessary, the slot position of PCI card can be changed to avoid resource conflict with graphics card

Boot Black Screen

phenomenon: boot black screen, no display, there may be an alarm

phenomenon analysis: poor contact between hardware, or hardware failure, related hardware involves memory, graphics card, CPU, motherboard, power supply, etc. The power of the computer should be supplied by the power supply first, and then the BIOS of the motherboard guides the self-test, and then through the CPU, memory, graphics card, etc. This process is reflected in the screen called self-test, first through the BIOS information of the graphics card, then the motherboard information, then the memory, hard disk, optical drive, etc. If something goes wrong in the middle, the computer will not start normally, or even the screen will be black

countermeasures: first, confirm whether the external connection and internal connection are connected smoothly. The external connection includes monitor, host power supply, etc. There is a connection between the host power supply and the host power supply interface (sometimes the connection is poor here). More common reasons are: graphics card, memory e to the use of a long time, long-term contact with the st in the air, resulting in gold finger oxide layer, resulting in poor contact. In this regard, with cotton stick moderate alcohol back and forth to wipe the golden finger, to dry after inserting back. In addition, observe whether the CPU works normally. After half a minute, touch the heat sink of the CPU fan by hand to see if there is temperature. With temperature, the possibility of CPU failure can be basically ruled out. There is no temperature to sort out the CPU socket, to ensure that the contact is in place. After that, your CPU can be upgraded before the temperature is too high: (in addition to the above method, there is a must kill technique: use the method of unplugging to clear the BIOS settings or replace the CMOS battery of the motherboard. When all of these methods have been tried and failed

10. 1. System fault analysis
if it is a system fault, the following should be checked emphatically:
1) whether the system files are normal
2) whether the version of DOS or windows operating system is compatible
3) whether multiple operating systems are compatible
4) system config. Whether the sys file or windows registration file is correct
5) whether the memory of the computer is wrong

2. Program failure analysis
if it is identified as a program failure, It is necessary to check the following contents:
1) whether the running environment of the program is suitable
2) whether the installation method of the program is correct
3) whether the program itself is complete
4) whether the program itself has always or bug5) whether the operation method of the program is correct
6) whether the program conflicts with other software

3) virus impact analysis
currently, Computer virus is very rampant, and more destructive, latent. If a computer is infected with a virus, it will not only affect the normal operation of the brain, slow down the speed of the machine, but also cause the complete collapse of the whole computer. The following are some abnormal conditions caused by
computer viruses:
1) when the program is run twice before, the previous one can run normally, After that, it won't work.
2) hard disk won't work.
3) keyboard doesn't respond.
4) mouse doesn't work.
5) printer can't print.
6) blue screen appears inexplicably ring operation.
7) computer suddenly restarts ring normal operation.
8) some inexplicable files or programs appear in the machine.
there are many kinds of computer viruses, We need to constantly understand in practice, and at the same time, we should pay attention to prevention, especially when connecting to the
network. Because one of the main ways of virus transmission is the network

when repairing soft fault, you can refer to the following experience:
1) when encountering computer fault, don't panic, you should carefully observe the working condition of the computer, according to the
abnormal phenomenon and the error prompt given by the computer, combined with the knowledge of troubleshooting, analyze and judge the cause of the fault

2) for the soft fault of the computer, we should first determine whether it is a system fault or a running program fault, and it is not invaded by
virus. In general, except the system files are damaged, or deleted or changed, there will be no big problem
and the application program is most likely to have problems. You can judge and analyze the running environment and operation of the application program according to the methods described above
to remove the fault
3) if you can't get rid of the fault, you must ask others for help or go to the repair site to prevent the fault from further expanding.