Why does the computer automatically reboot

　　First, the software aspect

1. Virus

The "Shockwave" virus also prompts the system to start automatically after 60 seconds.

Trojan programs remotely control all your computer's activities, including getting your computer restarted.

Remove viruses, trojans, or reload systems.

2. System File Damage

System files are corrupted, such as the Win2K under the Kernel32.dll,win98 fonts directory of the system runtime basic files are corrupted, the system will not complete initialization at startup and forced to reboot.

Workaround: Overwrite install or reinstall.

3. Timing software or scheduled task software works

If you set up a reboot or load some of your work programs in the program taskbar, the computer will start again when the timing comes. In this case, we can open the "Start" item, check that there are not familiar with their own execution files or other timed work procedures, shielding them and then power-on check. Of course, we can also enter the "Msconfig" command directly in "Run" to select the startup item.

　　Second, the hardware aspect

1. Chassis power supply is insufficient, DC output is not pure, dynamic response is slow.

Users or installed companies often do not attach importance to the power supply, the use of low-cost power supply, it is the biggest cause of automatic restart of the system one of the most suspicious.

① power output power is insufficient, when running large 3D games, such as CPU resources larger software, CPU needs high-power power supply, power supply is insufficient and overload causes power protection, stop output. When the power is off, the load is reduced and the power supply starts again. Because the protection/recovery time is very short, so give us the performance is the host automatic restart.

② power supply DC output is not pure, digital circuits require pure DC power supply, when the power supply of the DC output of the harmonic content is too large, it will lead to digital circuit work error, the performance is a recurrent crash or restart.

The ③CPU workload is dynamic, the demand for current is dynamic, and the dynamic response speed is required. Some poor quality power supply dynamic response time is long, will also lead to frequent panic or reboot.

④ Update equipment (high-end graphics/large hard disk/video card), the increase of equipment (burner/hard disk), power beyond the original power of the rated output power, will lead to frequent panic or restart.

Solution: Now for high-quality high-power computer power.

2. Bad memory thermal stability, chip damage or set error

Memory problems cause the system to restart the system to restart the probability of relatively large.

① memory thermal Stability is bad, boot can work, when the memory temperature rise to a certain temperature, it can not work properly, resulting in a panic or restart.

② memory chip is slightly damaged, the boot can pass self-test (set up fast start not fully detect memory), you can enter the normal desktop for normal operation, when running some I/O throughput of software (media playback, games, plane/3d drawing) will restart or panic.

Workaround: Replace the memory.

③ setting the CAS value of the memory too small can also cause memory instability, causing the system to automatically restart. It is generally preferable to use the BIOS default settings and do not change them yourself.

3.CPU temperature is too high or the cache is damaged

①CPU temperature is too high often can cause protective automatic restart. The reason is too high temperature is due to the chassis, CPU heat dissipation, the cause of poor CPU heat dissipation: heat sink material heat conductivity is low, radiator and CPU interface between the foreign body (many for quality assurance posts), fan speed is low, fan and radiator dust too much and so on. There are P2/P3 motherboard CPU below the temperature probe damage or P4 CPU internal temperature measurement circuit damage, the motherboard on the BIOS bug in a special condition of the temperature is not allowed, CMOS set the CPU protection temperature is too low, etc. will also cause a protective reboot.

②CPU internal secondary cache corruption is a common CPU failure. The degree of light damage, or can be started, you can enter the normal desktop for normal operation, when running some I/O throughput of software (media playback, games, plane/3d drawing) will restart or panic.

WORKAROUND: Block level two cache (L2) or first-level caching (L1) or replace CPU exclusions in CMOS.

Automatic restart caused by 4.AGP video card, PCI card (NIC, cat)

① external card work non-standard or poor quality, triggering AGP/PCI bus reset signal misoperation caused the system to reboot.

② also has the video card, the network card loose causes the system to restart the case.

5. The connection port, the serial port, the USB interface is connected with the faulty or incompatible external equipment automatically restarts

① peripherals are faulty or incompatible, such as the printer's mouth damage, a foot to the ground short-circuit, USB equipment damage to the ground short-circuit, pin definition, signal level is not compatible and so on.

② Hot Plug External equipment, jitter is too large, causing a signal or power supply instantaneous short circuit.

6. Optical drive internal circuit or chip damage

The optical drive is damaged and most of the performance is not readable disk/engraving. It is also due to internal circuit or chip damage caused the host in the process of a sudden restart. The optical drive itself is poorly designed and fireware with bugs. Also causes a reboot when the disc is read.

7. Chassis front panel reset switch problem

Chassis front panel Reset key is actually a normally open switch, the reset signal on the motherboard is +5v level signal, connected to reset switch. When the switch closes, the +5v level to the ground conduction, the signal level down to 0V, triggering the system reset reset, reset switch back to the normal position, at this time reset signal back to the +5v level. If the reset key is damaged, the switch is always in the closed position, the reset signal is 0V, the system can not be put on the self-test. When the reset switch is less elastic and the button is not easy to bounce, the switch will appear slightly vibrating to close. Which causes the system reset to reboot.

Solution: Replace the reset switch.

Also the organic box in the reset switch leads short circuit, causing the host to automatically restart.

8. Motherboard failure

The case of the motherboard causing an automatic reboot is rare. It is usually related to reset circuit fault, socket, socket has virtual welding, poor contact, individual chips, capacitors and other components damage.

　　Third, other reasons

1. Mains voltage instability

① Computer switching power supply operating voltage range is generally 170v-240v, when the mains voltage is less than 170V, the computer will automatically restart or shutdown.

Solution: Add a voltage regulator (not UPS) or 130-260v wide switching power supply.

② computer and air-conditioning, refrigerators and other large power consumption of a strip words, in these electrical start-up, the supply of computer voltage will be greatly affected, often on the performance of the system reboot.

The solution is to separate their power lines.

2. Strong magnetic interference

Do not underestimate electromagnetic interference, many times our computer crashes and reboots due to interference, both from the internal chassis CPU fans, chassis fans, graphics fans, graphics cards, motherboards, hard disk interference, but also from the external power line, inverter air-conditioning and even large equipment such as automobiles interference. If our host interference performance or poor shielding, there will be a host of accidental restart or frequent crash phenomenon.

3, AC power line connection error

Some users to the power line of 0 direct grounding (do not go to the 0 line of Watt-hour meter), resulting in automatic restart, because from the ground to introduce interference signals.

4. The quality of the plug or power outlet is poor, and the contact is bad.

Power sockets in the use of a period of time, the elasticity of the reed slowly lost, causing the plug and reed contact between the bad, resistance constantly changing, the ups and downs, the system will naturally be very unstable, once the current can not reach the minimum operating system requirements, the computer will restart. solution, the purchase of quality clearance of good sockets.

5. Too much dust caused the motherboard reset line short-circuit caused by automatic restart.