★ 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.