Computer reboot caused by motherboard

General computer failure is due to the power supply is insufficient, mains voltage instability and caused by power supply is not normal, or the computer has a circuit failure and other reasons. But the author encountered this time is the motherboard causes a reboot failure.

Configuration: Tepo P4 MFM motherboard, 256MB modern DDR, 40GB West Czech cool fish, xiaoying pa 7900Ti 64MB DDR, Great Wall 300W P4 power supply.

Failure phenomenon: The customer's new computer, the computer will sometimes restart, not time, sometimes on the restart, sometimes the use of a day does not restart.

Troubleshooting: The author to customer home check, the computer used a PM did not restart once. It is estimated that there is no problem with the computer hardware, but it has also installed the system for the customer and upgraded the anti-virus software. But not long, the client calls again, or the same as the old, the author judged that this situation is likely to be the customer's home power lines have problems. The author has encountered such a problem: if the computer and refrigerators, air-conditioning and other regularly activated household appliances using a line, when the above electrical start-up, will produce close to its normal working time 10 times times the current, then the line voltage will be significantly reduced. When it is below 170V, the computer reboots.

In addition, if the customer's home line has bad contact, when the household appliances for a long time, there is a virtual connection because the contact resistance is large, it will heat, when the heat accumulation to a certain extent, contact with the wire will be heated expansion and instantaneous separation, then will also produce a restart phenomenon. In view of the above reasons, the author of this trip to the customer's home with a UPS power supply, carefully check the line, the computer is a separate power lead should not exist in the author's estimation of the problem. Because the symptom does not appear regularly, finally put ups to the customer to stay in use.

The next morning, as soon as they got to work, the client phoned to say that there was a reboot. No way, the author of the computer shipped to the company to check the machine, the motherboard, graphics, power, hard disk on the test bench for each test. Test, the author inadvertently moved the power cord, the host immediately restarted. The author found that as long as the power cord is manually used, the computer will restart immediately. Finally careful examination, found that the P20atx power sockets of a foot power-on with the motherboard tin plate exists virtual connection, there is a very slight crack. The original is it in Mischief Ah! Due to the warranty period, the author for the customer to change the same model of the motherboard, to the customer sent. Reboot failure never happened again.