●● First, software.

● 1. Virus damage

Soon after the computer appeared, computer viruses 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 it is virus damage or not, we can use the latest version of anti-virus software to carry out anti-virus, and generally find the existence of viruses. 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 damaged.

When system files are destroyed, such as KERNEL32.DLL under Win2K, fonts under Win98 FONTS 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.

For this kind of fault, because it can't enter the normal desktop, it can only be installed or reinstalled with cover.

● 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, 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 where the power supply is often unstable, 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 has poor quality and poor contact.

Most of the patch panels on the market are of poor quality, the internal contacts are all welded by hand, and acid flux is often used, which can easily lead to open circuit or leakage between live wire and zero wire 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.

Another possibility is the wall socket in our home. Most wall sockets are not installed by professionals, so the wiring inside the socket is very irregular. Especially if we often use high-power heaters in these sockets, it is easy to cause internal heating and oxidation to form intermittent power failure, resulting in computer restart or display flashing.

Solution:

(1) Don't buy cheap patch panels to save money. Buy some brand-name patch panels, because their insides are automatically installed and crimped by machines and do not need manual welding.

② As to whether it belongs to the problem of virtual connection inside the wall socket, we can try replacing the host with a 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 common, especially when we add new equipment to the host, such as replacing high-end graphics cards, adding burners and hard disks, 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.

On the other hand, the switching power supply of the host has poor performance. Although the voltage is stable and within the normal allowable range, due to the excessive harmonic content in its output power supply, it 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, with poor contact and tight insertion.

In this case, most of them will appear on DIY machines. The power cord of the host power supply failed 3C certification and did 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 ATX20 socket of motherboard power supply is soldered in a virtual way, resulting in poor contact.

This kind of fault is not common, but it does exist, mainly because when the host is working normally, move the 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 fastened.

Solution:

(1) If the solder joints of the main board are in virtual welding, repair the welding 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, it is best to replace a good power supply.

6.CPU problem

When some functional circuits in the CPU are damaged and the secondary cache is damaged, the computer can also be started, or even run normally on the ordinary desktop, but it will restart or crash when performing a special function, such as drawing tables, playing VCD and playing games.

Solution: Try to shield L2 or L 1 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 is likely to pass the self-test (most of them are set with POST), but it will be restarted unexpectedly because of the function failure caused by the high calorific value of 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 CD-ROM drive is damaged internally, it will also lead to slow startup or self-test failure of the host, 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, the internal reed is always in the short circuit position, and the host computer cannot power on for self-test. 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.

In another case, because the insulation layer of the reset switch lead in the chassis is peeled off too much during welding, unpacking many times during use will cause the reset switch lead to get too close, causing collision, 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 printer parallel port damage, a pin short circuit to ground, USB device short circuit to ground, network card work is not standardized. When we use these devices, the computer will restart because of a sudden short circuit.

●● Third, other reasons.

● 1. Poor heat dissipation or temperature measurement failure.

The CPU has poor heat dissipation, and the common problems are that the fixing clip of the CPU radiator falls off, there is a foreign body between the CPU radiator and the CPU, and the CPU fan has been used for a long time and the radiator has accumulated too much dust. These conditions will lead to poor heat dissipation of CPU, and the accumulated temperature will automatically restart if it is too high.

In addition, the temperature probe under the CPU is damaged or the temperature circuit inside the P4 CPU is damaged, and the BIOS on the motherboard has a BUG. In some special cases, temperature measurement is not allowed, which will lead to the automatic protective 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 failed.

When the speed measuring circuit of the CPU fan is damaged or the speed measuring cable is intermittently disconnected, the motherboard may mistakenly think that the fan stops automatically shutting down or restarting because the fan speed cannot be detected, but we may see that the CPU fan rotates normally and the speed measuring is normal when checking.

● 3. 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.