In fact, it is very simple to remove this fault. The method is to modify the registry: open the HKEY _ local _ machine \ system \ currentcontrolset \ control \ shutdown subitem, create a new "string value" in the right window, name it "FastReboot", and set the "numerical data" to 0.
2. The problems that should be considered when the computer starts automatically are as follows:
First, the software
1. virus
When the "shock wave" virus breaks out, it will also prompt the system to start automatically after 60 seconds.
Trojan horse programs remotely control all activities of your computer, including restarting your computer.
Remove viruses, Trojans or reinstall the system.
2. The system file is corrupted.
System files are destroyed, such as KERNEL32.DLL under Win2K, FONTS under Win98 fonts directory and other basic files when the system is running, which will be forced to restart when the system is started.
Solution: cover the installation or reinstall.
3. Timing software or task planning software works.
If you set a restart or load some working programs in the "Planning Taskbar", the computer will start again. In this case, we can open the "startup" item, check whether there are unfamiliar execution files or other scheduled working procedures, and then filter them before starting the inspection. Of course, we can also directly enter the "Msconfig" command in "Run" to select the startup item.
Second, the hardware.
1. Chassis power supply is insufficient, DC output is impure, and dynamic response is slow.
Users or installers often ignore the power supply and use cheap power supply, which is one of the biggest suspects that lead to the automatic restart of the system.
① The output power of power supply is insufficient. When running software that takes up a lot of CPU resources such as large 3D games, when the CPU needs high power supply, the power supply is overloaded due to insufficient power supply, and the output is stopped. After the power supply stops outputting, the load is lightened and the power supply is resumed. Because the protection/recovery time is very short, the performance given to us is that the host automatically restarts.
② The DC output of power supply is impure, and the digital circuit requires pure DC power supply. When the harmonic content in the DC output of the power supply is too large, it will lead to the working error of the digital circuit, which is manifested as frequent shutdown or restart.
③ The workload of ③③CPU is dynamic, so is the requirement for current, which requires fast dynamic response. Some poor quality power supplies have long dynamic response time, which will also lead to frequent crashes or restarts.
④ If the power of updating equipment (high-end graphics card/large hard disk/graphics card) and adding equipment (burner/hard disk) exceeds the rated output power of the original power supply, it will lead to frequent crashes or restarts.
Solution: Now replace the high-quality and high-power computer power supply.
2. The thermal stability of the memory is poor, and the chip is damaged or set incorrectly.
The probability of system restart caused by memory problems is relatively high.
① The thermal stability of the memory is poor, and it can work normally when it is turned on. When the memory temperature rises to a certain temperature, it will not work normally, resulting in a crash or restart.
(2) When the memory chip is slightly damaged, you can pass the self-check (set the quick start to detect the memory incompletely), or you can enter the ordinary desktop to run normally. When running some software with high I/O throughput (media playing, games, plane /3D drawing), it will restart or crash.
Solution: Replace the memory.
③ Setting the CAS value of the memory too small will also lead to the instability of the memory, leading to the automatic restart of the system. Generally, it is best to use the default settings of BIOS, and don't change them yourself.
3. number three. The CPU temperature is too high or the cache is damaged.
① Too high ①CPU temperature often leads to protective automatic restart. The reason for the high temperature is basically because the chassis and CPU are not well cooled. The reasons for poor heat dissipation of CPU are: low thermal conductivity of radiator material, foreign objects (mostly warranty cards) between radiator and CPU, low fan speed, too much dust on fan and radiator, and so on. Also, the temperature probe under the CPU of the P2/P3 motherboard is damaged or the temperature measuring circuit inside the P4 CPU is damaged, the BIOS on the motherboard has a BUG and temperature measurement is not allowed under certain special circumstances, and the CPU protection temperature set in CMOS is too low. This will also lead to a protective restart.
② The damage of the first-level and second-level caches inside the CPU is a common failure of the CPU. Slightly damaged ones can still be started, and can enter the normal desktop for normal operation. When running some software with high I/O throughput (media playing, games, plane /3D drawing), it will restart or crash.
Solution: Shield the second-level cache (L2) or the first-level cache (L 1) in CMOS, or replace the CPU to eliminate it.
4. Automatic restart caused by 4. AGP graphics card and PCI card (network card, cat)
① The nonstandard or poor quality of the external card leads to the failure of the reset signal of the AGP/PCI bus, which leads to the system restart.
(2) There is a situation that the system restarts due to the looseness of the graphics card and the network card.
5. When connecting to a faulty or incompatible external device, the parallel port, serial port and USB interface will automatically restart.
① Peripheral failure or incompatibility, such as printer parallel port damage, one pin short circuit to ground, USB device short circuit to ground, pin definition and signal level incompatibility, etc.
② The jitter of external equipment is too large when it is hot-plugged, resulting in instantaneous short circuit of signal or power supply.
6. The internal circuit or chip of the optical drive is damaged.
The optical drive is damaged, and most of them can't be read/engraved. There is also a sudden restart of the host due to internal circuit or chip damage during work. The CD-ROM drive itself is poorly designed, and there is a Bug in FireWare. It also causes a reboot when reading the disc.
7. The reset switch problem on the front panel of the chassis.
The reset key on the front panel of the chassis is actually a normally open switch, and the reset signal on the motherboard is a +5V level signal, which is connected to the reset switch. When the switch is closed, the +5V level is grounded, and the signal level drops to 0V, which triggers the system to reset and restart, and the reset switch returns to the normally open position, at which time the reset signal returns to the +5V level. If the reset key is damaged, the switch is always in the closed position, and the reset signal is always 0V, the system will not be able to power on for self-test. When the elasticity of the reset switch is weakened and the button is not easy to bounce when pressed, the switch will be easily closed with a slight vibration. Resulting in a system reset and restart.
Solution: Replace the reset switch.
There is also a short circuit in the reset switch lead in the chassis, which leads to the automatic restart of the host.
8. Motherboard failure
It is rare for the motherboard to cause an automatic restart. Generally, the circuit related to reset is faulty; Socket and slot have virtual welding and poor contact; Individual chips, capacitors and other components are damaged.
Third, other reasons.
1. The power supply voltage is unstable.
① The working voltage range of computer switching power supply is generally 170V-240V. When the power supply voltage is lower than 170V, the computer will automatically restart or shut down.
Solution: add voltage regulator (not UPS) or 130-260 V wide switching power supply.
(2) If high-power appliances such as computers, air conditioners and refrigerators use patch panels, when these appliances are started, the voltage supplied to computers will be greatly affected, which is often manifested in system restart.
The solution is to separate their power cords.
2. Strong magnetic interference
Don't underestimate electromagnetic interference. Many times, our computer crashes and restarts are also caused by interference. These interferences come from CPU fans, chassis fans, graphics cards, motherboards and hard disks inside the chassis, as well as external power cords, inverter air conditioners and even large equipment such as automobiles. If our host has poor interference performance or poor shielding, the host will restart unexpectedly or crash frequently.
3. Incorrect connection of AC power cord.
Some users directly ground the zero line of the power supply line (not the zero line of the electric energy meter), which leads to automatic restart, because the interference signal is introduced from the ground line.
4. The plug-in or power socket is of poor quality and poor contact.
After the power socket is used for a period of time, the elasticity of the reed slowly loses, which leads to poor contact between the plug and the reed, constant change of resistance and fluctuation of current, and the system will naturally be unstable. Once the current fails to meet the minimum requirements for system operation, the computer will restart. The solution is to buy a good socket with qualified quality.
5. Too much dust causes the reset line of the motherboard to be short-circuited and automatically restarted.
Fourth, some examples.
1.Error instance of CPU secondary cache
A compatible computer configured a few years ago: K6-2 200MHz CPU, motherboard using VX-Pro+ chipset, two 16MB 72 lines of EDO memory,
Windows 98 operating system. After the blue sky and white clouds appear, it will automatically restart, and it can't enter the safe mode, but only enter the MS-DOS mode. I guess it is more likely that the computer will restart because of the quality problem of the memory module, so I replaced the memory module of the same model for testing first, and the fault is still the same. Changing the power supply still doesn't solve the problem. Finally, only the motherboard, CPU and graphics card are left. I tried the graphics card, but there was no problem. I couldn't find the old motherboard that could hold K6-2 200MHz CPU, so I had to give up.
At that time, I also suspected that the BIOS settings might be wrong, and tried to restore to the default values, but it did not solve the problem. A few days later, when I was playing computer again, I accidentally entered the BIOS and set the internal cache of CPU to Disable. After saving and exiting, I restarted, and the system can actually start! It is estimated that there is something wrong with the CPU cache, so I set the cache to start the computer. Sure enough, the system can't start normally again. Windows 98 starts and runs programs much slower than before because the performance of CPU is greatly reduced after the cache is turned off. Finally, a new CPU is needed to solve the problem.
2. Example of power failure
The computer in the place where the author works has to be turned on every day (because there are many people surfing the Internet), and it is common to leave it on for ten days and a half months. Under such high working intensity, the failure rate of hardware equipment is also very high.
Symptoms: Two compatible computers, one CPU is Athlon XP 1700+, the other CPU is P4 1.7GHz, and the host power supply is Century Star. When the computer runs at full capacity for a period of time (at this time, the CPU utilization rate is kept at 100%, and the hard disk is also reading and writing a lot of data), it will be restarted automatically frequently. One of them has insufficient power when connecting a 60GB hard drive and an 80GB hard drive.
Fault analysis and treatment: Because these two computers are normally used for general work such as document editing and surfing the Internet, problems will only occur when a large number of calculations are carried out. At first it was suspected that the CPU temperature was too high, but the test showed that the temperature was normal. Check the hard disk and find that one of the hard disks has a bad track, but the fault still exists after replacing the hard disk and reinstalling the system. It seems that the bad track of hard disk is probably caused by frequent abnormal restart of computer. After replacing the new power supply, the fault disappeared.
When two old power supplies were disassembled, it was found that two electrolytic capacitors with the same model (3300μF/ 10V) had yellowish brown granular condensate on the top of one power supply, and two different models (1000μF/ 16V, 3300μF/ 16V) were also found in the other power supply. After spending money to buy the same type of capacitor replacement in the electronic market, they all returned to normal after testing. Here is a reminder, never connect the positive and negative poles of the capacitor upside down! Through analysis, it is found that the power grid of the author's unit is often suddenly cut off due to maintenance or improper use of electricity, which leads to capacitor breakdown on accessories. A motherboard also went on strike after a sudden power failure. After inspection, it was found that several large electrolytic capacitors were damaged and leaked, and they returned to normal after replacing the capacitors.
3. Examples of poor graphics card contact
Malfunction: My friend's computer is equipped with a monitor of BenQ BenQ 77G, a motherboard of Gigabyte 8IRX, a CPU of P4 1.6G, a hard disk of 80G, a fast-equipped 3000 graphics card of a cinematographer, a cat in the polar cloud waterfall, and a sound card with AC97 on the motherboard. Because the house is decorated and the computer has to be moved, all the connections behind the computer have to be removed. Later, after I connected the line myself, the computer couldn't start. The computer self-test is normal. After flashing the motherboard logo, the WINDOWS 98 startup screen appears, and then the cursor flashes. Everything is normal, but when the computer is about to enter the system, it suddenly restarts and beeps, which is the case several times.
Fault analysis: The author's friend is a pure "novice", and the preliminary judgment may be a general wiring problem, which is probably caused by the mouse and keyboard being connected backwards. First, I checked the computer wiring. No problem. Could it be that the wiring is loose? Reconnect all computers.
The fault remains the same. Select safe mode at startup to enter normal operation of the system. After restarting, enter the BIOS to check the CPU temperature. In the normal range, it is ruled out that the CPU is overheated and causes a restart. My friend didn't install new hardware either, so I ruled out the restart phenomenon caused by insufficient power supply. The reasons for the failure may be as follows
The next four aspects: first, software conflict; Second, the display resolution or refresh rate is set higher than the rated value; The third is the conflict between the graphics card and other hardware, or the driving problem; Fourth, the graphics card is faulty.
Troubleshooting: Ask a friend what he did to the machine before it broke down. My friend said that it had been used well before disassembling the machine, and no new software was installed. There is no clue, only from the above four possible reasons for failure. After restarting, enter the safe mode, run the msconfig command, and delete all startup items that are not needed by the operating system. After restarting, the fault still exists. It seems that it is not caused by software installation. Next let's see if the resolution and refresh rate are too high. In safe mode, delete the monitor and restart it, and the fault still exists. Finally, the problem focuses on the graphics card. Enter the safe mode again, delete the graphics card driver, skip the installation of the graphics card driver and enter the normal startup mode after restarting. It seems to be a driver problem or a failure caused by the conflict between the graphics card and other hardware. Download a new driver and see if it can solve this problem. Dial-up internet, the machine suddenly restarts, is the cat broken, too? What should I do? Is it really over? This computer can't be started because it was disassembled. The graphics card and the cat won't break down because of moving the machine, will they? Thinking of handling the machine, is it because the graphics card was knocked loose when disassembling the computer, resulting in poor contact and failure? With the idea of one last attempt, I opened the case, pulled out the graphics card and the cat, plugged it in again, installed the graphics card driver, restarted it, and saw a beautiful desktop. I tried to dial, no problem. The fault has been eliminated. It turned out that the fault was caused by poor contact of the graphics card.
Summary: The computer can't enter the system due to the poor contact of the above graphics cards, which is similar to the symptoms of graphics card failure. If you don't start with small problems, it will be really difficult to solve for a while, and you may even suspect that it is a hardware failure, which will be very troublesome.
■ Possible reasons for automatic computer restart ...
★ 1. Software
1. Virus damage
Soon after the computer appeared, the computer virus appeared. ※. When the network becomes the information artery of today's society, the spread of viruses is more convenient, so it also interferes with and destroys our normal work from time to time. A typical example is the "shock wave" virus that caused serious damage to computers around the world some time ago. When the outbreak occurs, you will also be prompted that the system will start automatically after 60 seconds. In fact, as early as the DOS era, many viruses can automatically restart your computer.
Whether the virus is damaged or not, we can use the latest version of anti-virus software to kill the virus, and generally we will find the existence of the virus. ※. Of course, there is another possibility that someone maliciously invaded your computer while you were surfing the Internet and implanted a Trojan horse program. In this way, the other party can remotely control all the activities of your computer, including, of course, restarting your computer. For some trojans, it is not easy to remove them, so it is better to reinstall the operating system.
◇ 2. The system file is corrupted.
※ When system files are destroyed, such as KERNEL32.DLL under Win2K, fonts under Win98FONTS directory and other basic files during system operation are destroyed, and the system will be forced to restart when it is started. You can do an experiment and try to rename the fonts in the WIN98 directory. When you turn it on again, our computer will start again and again.
☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆973
◇ 3. Timing software or task planning software works.
※ If you set a restart or load some work programs in the Planning Taskbar, the computer will restart when the time comes. In this case, we can open the "startup" item, check whether there are unfamiliar execution files or other scheduled working procedures, and then filter them before starting the inspection. Of course, we can also directly enter the "Msconfig" command in "Run" to select the startup item.
★ Second, hardware
◇ 1. The power supply voltage is unstable.
※ The working voltage range of switching power supply for general household computers is 170V-240V. When the power supply voltage is lower than 170V, the computer will automatically restart or shut down. Because we sometimes don't feel the fluctuation of the mains voltage, we will mistakenly think that the computer will automatically restart for no reason.
☆☆☆ Solution: For areas with unstable power supply, you can buy UPS power supply or 130-260 V wide switching power supply to ensure the stable operation of the computer.
◇ 2. The plug-in or power socket is of poor quality and poor contact.
※ Most of the power plugs in the market are of poor quality, the internal contacts are all welded by hand, and acid flux is often used, which will easily lead to solder joint oxidation and lead to open circuit or live wire neutral line leakage in future use. Due to manual welding and poor elasticity of the phosphor brass sheet, it is easy to lose elasticity in a short time, resulting in poor contact with the power plug of the host or display, resulting in a large contact resistance, and a large amount of heat will be generated after long-term work, which will be manifested as the restart of the host or the flashing of the black screen of the display.
We may use another wall socket in our house. ※。 Most wall sockets are not installed by professionals, so the wiring inside the socket is very irregular. Especially if we often use high-power electric heaters, these sockets can easily lead to internal heating and oxidation, resulting in intermittent power failure, computer restart or display flashing.
☆☆ Solution:
□ (1) Don't buy cheap and inexpensive patch panels to save money, but buy some brand-name patch panels, because their interiors are automatically installed and crimped by machines and do not need manual welding.
□②For the question of whether it belongs to the virtual connection inside the wall socket, we can try to replace the host with the wall socket to see if there is the same automatic restart problem.
◇ 3. The computer power supply is insufficient or its performance is poor.
This situation is also quite common, especially when we add new equipment to our host, such as replacing high-end graphics cards, adding burners, hard disks, etc., which is easy to appear. ※. When the host computer is working at full speed, such as running a large 3D game, high-speed burning or preparing to read a CD, when it is started, the dual disks will copy data, which may lead to power-off protection and stop output due to instantaneous power shortage. However, when the power supply stops outputting, the load is reduced, and then the power supply is started again. Because the recovery time after protection is very short, the performance given to us is that the host automatically restarts.
Another situation is that the switching power supply of the main engine has poor performance. ※. Although the voltage is stable and within the normal allowable range, the harmonic content in its output power supply is too large, which will also lead to frequent shutdown or restart of the host. In this case, we use a multimeter to test its voltage is normal. It is best to change an excellent power supply.
☆☆☆ Solution: Now replace the high-quality and high-power computer power supply.
◇ 4. The power plug of the host switch power supply is loose, the contact is poor, and the plug is not tight.
※ Most of this will happen on DIY machines, and the power cord of the host power supply has not passed 3C certification, so it does not match the power socket. When we shake the table or touch the host, the host will automatically restart, usually accompanied by a slight "click" sound.
☆☆☆ Solution: Replace the high-quality 3C certified power cord.
◇ 5. The socket of motherboard power supply ATX20 is soldered, and the contact is poor.
This kind of fault is not common, but it does exist, mainly by moving ATX20 pin plug left and right to see if the host will automatically restart. ※. At the same time, check whether the reed inside the 20-pin power plug is oxidized, which may easily lead to large contact resistance and poor contact, leading to the host computer crash or restart. Sometimes it is necessary to check whether the connecting wire at the tail of the 20-pin plug is firm.
☆☆ Solution:
□ (1) If the solder joint of the main board is in virtual welding, it can be repaired directly with an electric soldering iron. Note: When welding computer boards such as motherboards, hard disks and video cards, the soldering iron must be grounded properly or unplugged.
□ ② If it is a power problem, you'd better change it to a good one.
◇ 6.CPU problem
※ When some functional circuits in the ※CPU are damaged and the secondary cache is damaged, the computer can be started, or even enter the ordinary desktop for normal operation, but it will restart or crash when performing a special function, such as drawing a watch, playing VCD, playing games, etc.
☆☆ Solution: Try to shield the second-level cache (L2) or the first-level cache (L 1) in CMOS to see if the host can run normally; Or just change to a good CPU. If it can work normally after shielding, it can still be used It's slower, but it will save money.
7. Memory problems
※ If a chip on the memory stick is not completely damaged, it will probably pass the self-check (most of them are set by POST), but it will be restarted unexpectedly because of the function failure caused by the large heat generated by the memory during operation. Many times, when the memory is damaged, the opportunity will call the police, but after the memory is damaged, there will still be faults such as no alarm and no power supply. It is best to use the elimination method, which can quickly determine the fault location.
◇ 8. Optical drive problem
※ If the optical drive is damaged internally, it will also cause the host to start slowly or fail the self-test, or it may suddenly restart during work. In the latter case, if we replace the optical drive, it is likely that the power consumption of the optical drive will be different. What you need to know is that although the ATPI interface of the optical drive is the same, the pin definitions of different manufacturers are different. If there is something wrong with our hard disk cable, there may be no problem with one brand of optical drive, but other brands of optical drives will not work, so you need to pay attention.
There is something wrong with the quality of ◇ 9.▽9 Reset key.
※ If the reset switch is damaged and the internal reed is always in short circuit position, the main engine will not be able to conduct power-on self-inspection. However, when the elasticity of the reset switch is weakened or the buttons on the chassis are not easy to bounce up, it will appear during use, because the chassis is occasionally touched or the host suddenly restarts under normal use. Therefore, when the reset switch cannot be pressed freely, it must be carefully checked, and it is best to replace the new reset button switch or lubricate the external button of the chassis.
There is another case, because the insulation layer of the reset switch lead in the chassis falls off too much during welding, unpacking many times during use will lead to the collision of the reset switch lead, which will lead to the automatic restart of the host. ※.
◇ 10. Automatically restart when connecting the network card or parallel port, serial port and USB interface to external equipment.
※ This situation is generally due to peripheral failures, such as damage of printer parallel port, short circuit of a pin to ground, short circuit of USB device to ground, and nonstandard work of network card. When we use these devices, the computer will restart because of the sudden short circuit of the power supply. ☆ Old demon finishing ☆
★ Third, other reasons
◇ 1. Poor heat dissipation or temperature measurement failure.
※CPU has poor heat dissipation, and the common problems are that the fixing clip of CPU radiator falls off, and there are foreign objects between CPU radiator and CPU. After CPU fan is used for a long time, the radiator accumulates too much dust, which will lead to poor heat dissipation of CPU, and it will automatically restart if the accumulated temperature is too high.
※ In addition, the temperature probe under the CPU is damaged, or the temperature measuring circuit inside P4CPU is damaged, and there is a BUG in the BIOS on the motherboard, which will lead to the automatic protection restart of the host at work.
※ Finally, the CPU protection temperature we set in CMOS is too low, which will also lead to the automatic restart of the host.
◇ 2. Fan speed measurement failure
※ When the speed measuring circuit of the CPU fan is damaged or the speed measuring cable is intermittently disconnected, the motherboard will mistakenly think that the fan will stop to automatically shut down or restart because the fan speed cannot be detected, but when we check, we may see that the CPU fan rotates normally and the speed measuring is normal.
3. Strong magnetic interference
Do not underestimate electromagnetic interference. Many times our computer crashes and restarts are also caused by interference, which comes from the interference of CPU fan, chassis fan, graphics card fan, graphics card, motherboard and hard disk inside the chassis, as well as from external power cord, inverter air conditioner and even large equipment such as cars. ※. If our host has poor interference performance or poor shielding, the host will restart unexpectedly or crash frequently.