The correct way to shut down the desktop when the desktop is turned on

Computer shop news now computer users are increasing rapidly, and the computer problems encountered are more and more. Some time ago, a classmate encountered a computer problem. The classmate computer automatically shuts down after a few seconds of running, just like a sudden break. The electricity is the same, but the keyboard light is still bright, but sometimes if it does not happen, the computer will run very well until I shut down normally, and if I shut down the night before, the next day This situation will definitely occur. I will take it to repair, and I will be able to start the computer when I am repairing the computer. The person who repairs the computer says that there is no problem. Computer configuration: Operating system Windows XP Professional 32-bit SP3 (DirectX 9.0c) processor AMD Athlon (Athlon) 64 X2 dual-core 4200+ motherboard Onda NF520A (Nvidia MCP65) memory 1 GB (A-DATA DDR2 667MHz) Main hard drive Western Digital WDC WD800BB-00JHC0 (80 GB /7200 rpm) Graphics Card Nvidia GeForce 8500 GT (256 MB /Colorful) Display @@@0000 Sound Card Nvidia MCP65 High Fidelity Audio NIC Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller /Dell Analytical Processing: First, troubleshoot the software and system problems, re-install the computer system to see if the computer is used normally after installing the system, then prove that the computer is a system or software problem, reinstall the system can be solved, if the computer problem after installing the system Still, then you should consider whether the hardware is a problem, and re-insert the memory and try it. It is really impossible to send a computer repair shop to solve it.