Identify the cause of Automatic Computer Shutdown

1. Virus destruction

Computer viruses have emerged shortly after computers. When the network becomes the information artery of today's society, the spread of viruses is more convenient, so it also interferes with and damages our normal operation from time to time. A typical attack is the "Shock Wave" virus that caused serious damage to computers around the world some time ago. It also prompts that the system will start automatically 60 seconds later. In fact, as early as the DOS era, many viruses can automatically restart your computer.

If the virus is damaged, we can use the latest anti-virus software for antivirus purposes. Generally, viruses are detected. Of course, another possibility is that when you access the Internet, someone maliciously invades your computer and places Trojans.Program. In this way, the other party can remotely control all activities on your computer, including restarting your computer. It is not easy to clear some Trojans. It is best to reinstall the operating system.

2. System File Corruption

When system files are damaged, such as kernel32.dll under Win2k, font under Win98 fonts, and other basic files during system operation, the system is forced to restart because initialization cannot be completed during startup. You can perform a test to rename the fonts library under the Win98 directory. When you start the instance again, our computer will start again and again.

For such a fault, because you cannot enter the normal desktop, you can only overwrite or reinstall it.

3. Timing software or scheduled task software works

If you have set a restart or load some work programs in the "scheduled task bar", the computer will start again when the scheduled time arrives. In this case, we can open the "Start" item to check whether there are any execution files or other scheduled work programs that we are not familiar with, block them, and then start the system. Of course, you can also directly enter the "msconfig" command in "run" to choose to start

Ii. Hardware

1. Unstable mains voltage

Generally, the working voltage range of the switching power supply for home computers is 170 V-240 V. When the mains voltage is less than V, the computer will automatically restart or shut down. Because of the fluctuation of the mains voltage, we sometimes cannot feel it, so we may mistakenly think that the computer will automatically restart for an inexplicable reason.

Solution: for areas with frequent power supply instability, we can purchase a UPS power supply or a wide switch power supply of 130-260v to ensure computer stability.

2. Poor quality of plug-in or power outlet, poor contact

Most of the power plug-ins on the market have poor quality. The internal contacts are all manually welded and acidic flux is often used, in this way, the solder joints may be oxidized in future use, resulting in an open circuit or leakage between the FireWire and the zero line. Because of manual welding and poor elasticity of phosphorus Brass Sheets, it will take less time to lose elasticity, resulting in poor contact with the power plug of the host or display, resulting in a large contact resistance, during a long period of work, a large amount of fever may cause virtual connection, which may result in host restart or black screen flashing.

Another possibility is the wall sockets used in our house. Most wall sockets are not installed by professional staff, so the internal wiring of the sockets is very nonstandard, in particular, if we often use high-power heaters, these sockets may easily lead to internal heating, oxidation, and intermittent power failure, resulting in computer restart or blinking display.

Solution:

① Do not figure to save money and purchase cheap and not beautiful power plug-in, buy some famous brand power plug-in, because its internal is machine automatic installation of crimping, not using manual welding.

② For the Internal Failure of the wall socket, we can change the host to a wall socket to check whether the same Automatic Restart problem exists.
3. Insufficient computer power supply or poor performance

This situation is also common, especially when we add new devices to our host, such as replacing the high-end graphics card, adding a burner, and adding a hard disk, it is very easy to appear. When the host is working at full speed, such as running a large 3D Game and burning or preparing to read the disc at high speed, when the host is just started, the dual hard disk copies data, the output may be stopped due to insufficient Instantaneous Power Supply and power protection. However, when the power supply stops, the load is reduced, and the power supply starts again. Because the recovery time after the protection is very short, the performance is that the host restarts automatically.

Another case is that the performance of the host's switching power supply is poor. Although the voltage is stable, it is within the permitted range, but the harmonic content in the output power supply is too large, it also causes frequent host crashes or restarts. In this case, we use a multimeter to test its voltage. It is best to replace an excellent power supply for troubleshooting.

Solution: Change the high-power computer power supply.

4. The mains plug of the switch power supply of the host is loose, poor contact, and no plug-in is tight.

In this case, most of them will occur on DIY machines. the power cord of the host power supply is not certified by 3C and does not match the power outlet. When we shake the table or touch the host, the host will automatically restart, usually accompanied by a slight electric fire.

Solution: Replace the 3C certified power cord.

5. the power source of the motherboard atx20 socket has virtual welding, poor contact

This kind of fault is uncommon, but it does exist. It is mainly when the host is working normally, move the atx20 pin around to see if the host will automatically restart. At the same time, check whether there is oxidation in the reed inside the 20-pin power plug, which can easily lead to large contact resistance, poor contact, and host crash or restart. Sometimes you also need to check whether the connection lines at the end of the 20-pin plug are secure.

Solution:

① If the solder joint of the Main Board is virtualized, you can directly use the soldering iron to complete the welding. Note: When welding the motherboard, hard disk, video card, and other computer boards, be sure to properly ground the soldering iron, or unplug the power plug during welding.

② If it is a power supply problem, it is best to replace a good power supply.

6. CPU Problems

Some functional circuits inside the CPU are damaged. When the secondary cache is damaged, the computer can start up, and even enter the normal desktop for normal operations, however, when performing a special function, the system restarts or crashes, creates a picture table, plays VCD, and plays games.

Solution: try to block the second-level cache (L2) or first-level cache (L1) in CMOS to check whether the host can run normally. Then, simply use the CPU to replace and eliminate it. If it runs normally after blocking, it can still be used together. Although the speed is slower, it will save money.

7. Memory problems

If a chip on the memory stick is not completely damaged, it is likely to pass self-check (most of them must have post configured ), however, during running, the function will be restarted unexpectedly due to the high memory heat and failure. In most cases, an alarm is triggered when the memory is damaged. If the memory is damaged, no alarm is triggered. If the memory is not powered on, there are still some faults. It is best to use exclusion to quickly determine the fault location.

8. Optical Drive Problems

If the internal drive is damaged, the host may be slow to start or cannot pass self-check, or it may be restarted suddenly during work. For the latter case, if we change the optical drive, it is likely that the power consumption of the optical drive is different. Although the atpi interfaces of the optical drive are the same, the pin definitions of different manufacturers are different. If there is a problem with the hard drive line, there may be no problems with the use of a certain brand of optical drive, but it will not work for other brands of optical drive, which requires attention.

9. The reset key quality is incorrect.

If the reset switch is damaged and the internal Reed is always in the transient position, the host cannot perform self-check. However, when the reset switch is elastically weakened or the button on the chassis is not easily loaded, it will appear during use, the host suddenly restarts because the host is occasionally touched or in normal use. Therefore, when the reset switch cannot be pressed freely, we must check carefully. It is best to change the new reset button switch or refresh the external button of the chassis.

Another case is that the reset switch leads in the chassis are too stripped of the insulation layer during welding. In addition, multiple unpacking during use will cause a collision when the reset switch line is too close, the host is automatically restarted.

10. Automatically restarts when the network adapter or parallel port, serial port, or USB interface is connected to external devices.

This situation is generally caused by peripheral faults, such as the parallel port damage of the printer, a short circuit to the ground, a short circuit to the ground due to damage to the USB device, and non-standard Nic workmanship, when we use these devices, the computer restarts due to a sudden short circuit of power supply.

Iii. Other reasons

1. Poor heat dissipation or temperature measurement failure

CPU cooling is poor. The common problem is that the fixed card of the CPU radiator falls off. There is a foreign body between the CPU radiator and the CPU. After the CPU fan is used for a long time, there is too much dust in the radiator, these situations will lead to poor CPU cooling, high accumulation temperature and automatic restart.

In addition, the temperature measurement Probe under the CPU is damaged or the internal temperature measurement circuit of the P4 CPU is damaged. The bios on the motherboard has a bug and the temperature measurement is inaccurate under certain special conditions, these will cause the host to automatically restart during work.

At last, the CPU protection temperature we set in CMOS is too low, which will also cause the host to automatically restart.

2. fan speed failure

When the speed control circuit of the CPU fan is damaged or the speed control line is intermittently broken, the system will mistakenly think that the fan will be shut down or restarted automatically because the speed of the fan cannot be detected on the motherboard, however, we may see that the CPU fan turns normally and the speed is also normal.

3. Strong Magnetic Interference

Do not underestimate electromagnetic interference. In many cases, our computer crashes and restarts because of interference, these disturbances come from CPU fans, chassis fans, graphics card fans, graphics cards, motherboard, and hard disks in the chassis, as well as from external power lines, variable-frequency air conditioners, and even large equipment such as automobiles. If our host suffers poor interference performance or poor shielding performance, unexpected host restart or frequent crashes may occur.

Computer problems are strange, but if we can understand the basic working principle of the computer, we will be able to eliminate the computer's hardware and software faults, rather than getting bigger every day. I hope this article will help you.