★ 1. Software

â—‡ 1. Virus damage

p>※※ Soon after the computer came into being, computer viruses came into being. 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 it breaks out, it will also prompt that the system will start automatically after 6 seconds. In fact, as early as the DOS era, many viruses can automatically restart your computer.

p>※※ Regarding whether it is virus damage, we can use the latest version of anti-virus software for anti-virus, and generally we will find that the virus exists. Of course, there is another possibility that someone maliciously hacked into your computer when you were surfing the Internet and placed a Trojan horse program. 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.

â—‡ 2. System files are damaged

p>※※ When system files are damaged, such as KERNEL32.DLL under Win2K, fonts under Win98FONTS directory and other basic files during system operation are damaged, 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 repeatedly.

☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆973

â—‡ 3. Timing software or task planning software works

p>※※ If you set up a restart or load some work programs in the "Planning Taskbar", the computer will start again when the timing comes. In this case, we can open the "startup" item and check whether there are any unfamiliar execution files or other scheduled work programs in it, and then screen them before starting up for inspection. Of course, we can also directly enter the "Msconfig" command in "Run" to select the startup item.

★ 2. Hardware

â—‡ 1. The mains voltage is unstable

p>※※ The working voltage range of the switching power supply of a general household computer is 17V-24 V. When the mains voltage is lower than 17 V, 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 automatically restarts for no reason.

☆☆☆ Solution: For areas with unstable power supply, we can purchase UPS power supply or 13-26 V wide switching power supply to ensure the stable operation of computers.

â—‡ 2. The quality of the plug-in strip or power socket is poor, and the contact is poor

※※※※ Most power plug-in strips on the market are of poor quality, and the internal contacts are all welded by hand, and acid flux is often used, which will easily lead to open circuit or leakage between live wire and zero wire in future use. Because of manual welding and the 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 monitor, resulting in a large contact resistance, which will lead to a large amount of heat when working for a long time, and then it will be manifested as the restart of the host or the flashing of the black screen of the monitor.

p>※※ There is another wall socket that may be used in our home. Most of the wall sockets are not installed by professionals, so the wiring inside the socket is very nonstandard. Especially, if we often use high-power heaters, these sockets will easily lead to internal heating and oxidation, which will lead to intermittent power failure, causing computer restart or display blinking.

☆☆☆ Solution:

â–¡â‘  Buy cheap and not good power strips instead of saving money, and buy some famous brand power strips, because all of them are automatically installed and crimped by machines without manual welding.

â–¡â‘¡As to whether it is a virtual connection in the wall socket, we can try changing the host into a wall socket to see if there is the same automatic restart problem.

â—‡ 3. The power of computer power supply is insufficient or its performance is poor

※※ This situation is also relatively common, especially when we add new equipment to our host, such as replacing high-end graphics cards, adding burners and adding hard disks, it is easy to appear. When the host computer is working at full speed, such as running a large 3D game, burning at high speed or preparing to read a CD, when it is just started, double disk will copy data, which may cause power protection and stop output because of the instantaneous power shortage. However, when the power supply stops output, 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.

※※ There is another situation, that is, the performance of the switching power supply of the main engine is poor. 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 the frequent shutdown or restart of the main engine. In this case, it is normal when we use a multimeter to test its voltage. It is best to replace it with an excellent power supply.

☆☆☆ solution: replace the high-quality and high-power computer power supply.

â—‡ 4. The mains plug of the main switch power supply is loose, the contact is poor, and it is not plugged tightly.

p>※※ Most of these cases will appear on DIY machines, and the power cord of the main switch power supply has not passed 3C certification, which is not compatible with the power socket. When we shake the table or touch the host, the host will automatically restart, which is usually accompanied by a slight "snapping" sound.

☆☆☆ Solution: Replace the high-quality 3C certified power cord.

â—‡ 5. The power supply ATX2 socket of the motherboard has virtual welding and poor contact

※※ This kind of fault is not common, but it does exist. It is mainly to move the ATX2 pin plug left and right to see if the host will automatically restart. At the same time, check whether the reed inside the 2-pin power plug is oxidized, which can easily lead to large contact resistance and poor contact, causing the host to crash or restart. Sometimes it is necessary to check whether the connecting wires at the tail of the 2-pin plug are secure.

☆☆☆ Solution:

â–¡â‘  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 graphics cards, be sure to ground the soldering iron well or unplug the power plug during welding.

â‘¡ If it is a power problem, it is best to replace it with a good one.

â—‡ 6. CPU problems

※※※※ When some functional circuits inside the CPU are damaged and the secondary cache is damaged, the computer can also start, and even enter the normal desktop for normal operation, but it will restart or crash when performing a special function, such as drawing tables, playing VCD and playing games.

☆☆☆ Solution: Try to shield the second-level cache (L2) or the first-level cache (L1) in CMOS to see if the host can run normally; Or directly replace it with a good CPU. If it can run normally after shielding, it can still be used. Although it is slower, it will save money.

â—‡ 7. Memory problems

p>※※ 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 large heat of the memory during operation. Most of the time, when the memory is damaged, the opportunity will give an alarm, but after the memory is damaged, there are still faults of not giving an alarm and not powering up. It is best to use the elimination method, which can quickly determine the fault location.

â—‡ 8. Problems with optical drive

p>※※ 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 is different. What you need to know is that although the ATPI interface of optical drives is the same, the pin definitions of different manufacturers are different. If there is something wrong with our hard disk cable, it may happen that there is no problem with one brand of optical drives, but it will not work with other brands of optical drives, which needs your attention.

â—‡ 9. There is something wrong with the quality of the RESET key

p>※※ If the reset switch is damaged and the internal reed is always in the short-circuited position, the host computer cannot power on for self-inspection. However, when the elasticity of the RESET switch is weakened or the button on the chassis is 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, we must check it carefully, and it is best to replace it with a new RESET button switch or lubricate the external buttons of the chassis.

p>※※ There is another case, because the insulation layer of the RESET switch lead wire in the chassis is peeled off too much during welding, and unpacking many times during use will cause the RESET switch wire to be too close and cause collision, which will lead to the automatic restart of the host.

â—‡ 1. Automatically restart when connecting the network card or the parallel port, serial port and USB interface to external equipment

p>※※ This situation is generally due to peripheral faults, such as the damage of the parallel port of the printer, the short circuit of one foot to the ground, the short circuit of USB equipment, the nonstandard work of the network card, etc. When we use these devices, the computer will be restarted due to a sudden short circuit of power supply. ☆☆☆䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖䴖𰰶𰰶𰰶䴖䴖䴖䴖19

p>※※ There is also a damage to the temperature measuring probe under the CPU or the temperature measuring circuit inside the P4CPU, and a BUG in the BIOS on the motherboard that makes the temperature measurement inaccurate under certain special conditions, all of which will cause the host computer to automatically restart protectively during work.

p>※※ Finally, if the CPU protection temperature we set in CMOS is too low, the host will automatically restart.

â—‡ 2. Failure of fan speed measurement

※※※ When the speed measurement circuit of CPU fan is damaged or the speed measurement line is intermittently broken, the motherboard will mistakenly think that the fan is stopped and automatically shut down or restart because it cannot detect the speed of the fan, but we may see that the CPU fan rotates normally and the speed measurement is normal when checking.

â—‡ 3. Strong magnetic interference

p>※※ Don't underestimate electromagnetic interference. Many times, our computer crashes and restarts are also caused by interference, which comes from internal CPU fans, chassis fans, graphics cards, motherboards and hard disks, as well as external power lines, inverter air conditioners and even large equipment such as automobiles. If the jamming performance of our host is poor or the shielding is poor, the host will restart unexpectedly or crash frequently.