The reason for the automatic restart after the computer is turned off and the solution

A lot of friends' computers will take a long time to restart after the shutdown. How to solve this problem?

One: hardware aspects 1. The chassis power supply is insufficient, the DC output is not pure, and the dynamic response is slow. Users or installers often do not pay attention to the power supply, using inexpensive power supplies, so it is one of the biggest suspects that cause the system to automatically restart. 1 The output power of the power supply is insufficient. When running large-scale 3D games and other software that consumes a lot of CPU resources, when the CPU needs high-power supply, the power supply is insufficient and the overload causes power protection and stops output. After the power supply stops output, the load is reduced and the power is turned on again. Since the protection/recovery time is very short, the performance given to us is that the host automatically restarts. 2 The power supply DC output is not pure, and the digital circuit requires pure DC power supply. When the harmonic content of the DC output of the power supply is too large, the digital circuit will work incorrectly, and the performance is a frequent crash or restart. The 3CPU's workload is dynamic, the current requirements are dynamic, and the dynamic response speed is required. Some poor quality power supplies have long dynamic response times and can cause frequent crashes or restarts. 4 update the device (high-end graphics card /large hard disk /video card), increase the device (burner /hard disk), the power exceeds the rated output power of the original power supply, it will lead to frequent crashes or restarts. Solution: Now change the high quality and high power computer power supply. 2. The memory thermal stability is poor, the chip is damaged, or the memory is set incorrectly. The chance of the system restarting is relatively large. 1 memory thermal stability is poor, the boot can work normally, when the memory temperature rises to a certain temperature, it will not work properly, resulting in a crash or restart. 2 When the memory chip is slightly damaged, the boot can pass the self-test (set the quick start to not fully detect the memory), or enter the normal desktop for normal operation, when running some software with large I/O throughput (media play, game, plane) /3D drawing) will restart or crash. Solution: Replace the memory. 3 Setting the CAS value of the memory too small will also cause the memory to be unstable, causing the system to automatically restart. It is generally best to use the BIOS default settings, do not change it yourself. 3. CPU temperature is too high or the cache is corrupted. 1CPU temperature is too high and often causes a protective automatic restart. The reason why the temperature is too high is basically due to the poor heat dissipation of the chassis and the CPU. The reason for the poor heat dissipation of the CPU is that the material of the heat sink has a low thermal conductivity, and there is a foreign object between the heat sink and the CPU contact surface (mostly a warranty), and the fan speed is low. The fan and radiator are too dusty and so on. There is also a P2/P3 motherboard CPU under the temperature probe is damaged or the P4 CPU internal temperature measurement circuit is damaged, the BIOS on the motherboard has a BUG under certain special conditions, the temperature is not accurate, the CPU protection temperature set in CMOS is too low, etc. Etc. also causes a protective restart. The 1st and 2nd cache corruption inside the 2CPU is a common fault of the CPU. If the damage is light, it can still be started. It can enter the normal desktop for normal operation. When running some software with large I/O throughput (media play, game, plane/3D drawing), it will restart or crash. Solution: Block the L2 cache (L2) or L1 cache (L1) in CMOS, or replace the CPU to exclude. 4. AGP graphics card, PCI card (network card, cat) caused by the automatic restart 1 external card work is not standard or poor quality, causing the AGP /PCI bus RESET signal malfunction caused the system to restart. 2 There are also cases where the graphics card and network card are loose and cause the system to restart. 5. The parallel port, serial port, and USB interface are automatically restarted when a faulty or incompatible external device is connected. There is a fault or incompatibility. For example, the parallel port of the printer is damaged, a foot is short-circuited to the ground, and the USB device is short-circuited to the ground. Pin definitions, signal levels are not compatible, and more. 2 When the external device is hot plugged, the jitter is too large, causing a short circuit of the signal or power supply. 6. The internal circuit or chip of the optical drive is damaged by the optical drive. Most of the performance is that the disk/disk cannot be read. There is also a sudden restart of the host during work due to internal circuit or chip damage. The design of the optical drive itself is poor, and FireWare has bugs. It also causes a reboot when reading a disc. 7. The RESET switch on the front panel of the chassis The RESET button on the front panel of the chassis is actually a normally open switch. The RESET signal on the motherboard is a +5V level signal connected to the RESET switch. When the switch is closed, the +5V level is turned on to ground, the signal level is reduced to 0V, the system resets and restarts, and the RESET switch returns to the normally open position. At this time, the RESET signal returns to the +5V level. If the RESET button is damaged, the switch is always in the closed position, the RESET signal is always 0V, and the system cannot be powered on. When the RESET switch is weakened and the button is pressed down to make it difficult to bounce, it will appear that the switch is slightly vibrated and easy to close. This causes the system to reset and restart. Solution: Replace the RESET switch. There is also a short circuit in the RESET switch lead in the chassis, causing the host to automatically restart. 8. Motherboard failure The case of the motherboard causing an automatic restart is rare. Generally, the circuit related to RESET is faulty; the socket and the socket have a weak solder joint, and the contact is poor; and individual components such as chips and capacitors are damaged. Second, other reasons 1. The mains voltage is unstable. The operating voltage range of the switching power supply of the computer is generally 170V-240V. When the mains voltage is lower than 170V, the computer will automatically restart or shut down. Solution: Add a voltage regulator (not a UPS) or a wide-range switching power supply of 130-260V. 2 Computers and air conditioners, refrigerators and other high-power appliances share a power strip, then when these appliances start, the voltage supplied to the computer will be greatly affected, often as a system restart. The solution is to separate their power lines. 2. Strong magnetic interference should not underestimate electromagnetic interference. Many times our computer crashes and restarts because of interference. These interferences are caused by internal CPU fan, chassis fan, graphics card fan, graphics card, motherboard, hard disk, and external interference. The power line, inverter air conditioner and even large equipment such as cars interfere. If the interference performance of our host is poor or the shielding is poor, the host will restart unexpectedly or crash frequently. 3. The AC power supply line is connected incorrectly. The user directly grounds the neutral line of the power supply line (does not go through the neutral line of the power meter), resulting in automatic restart, because the interference signal is introduced from the ground line. 4. The quality of the strip or power outlet is poor and the contact is poor. After the power socket is used for a period of time, the elasticity of the reed is slowly lost, resulting in poor contact between the plug and the reed, the resistance changes constantly, and the current fluctuates accordingly, the system will naturally be unstable, once the current does not reach the system operation. At the minimum, the computer is rebooted. The solution is to buy a good outlet for quality. 5. Too much dust causes the main board RESET line to short circuit and cause an automatic restart. Three: Software: 1. The virus, like last year's "Blast Wave" virus will also prompt the system will automatically start after 60 seconds. The Trojan program controls everything from your computer remotely, including restarting your computer. Remove viruses, Trojans, or reinstall systems. 2. The system file is damaged. The system file is corrupted. For example, KERNEL32.DLL under Win2K, the font below the system directory, etc., the basic file is destroyed when the system is running. The system will not be able to complete initialization and force restart when it starts. Workaround: Overwrite installation or reinstallation. 3. The timing software or scheduled task software works. If you set up a reboot or load some work programs in the “plan task bar”, the computer will start again when the time is up. In this case, we can open the “Start” item to check whether there are any unfamiliar executable files or other timed work programs, shield them and then boot them. Of course, we can also enter the "Msconfig” command directly in the "Run" However, the general shutdown and restart have a great relationship with the hardware. Tips: Introduce the reason and solution for automatic restart after the computer is turned off. As long as you follow the troubleshooting reasons provided above, the problem will be solved quickly!