Faulty Bios, Motherboard, RAM ?

[physics kiddy]

My friend's computer restarts after the BIOS screen. There's only one key to press, F2 on the BIOS Screen. Windows XP SP 2 never opens. He says that the problem began after his computer shut down after a power cut. His UPS was not well then. So, he put it on direct supply. What should I do to fix the problem ?

Configuration is:

Intel Core 2 Duo Processor
Ram - 2 Gb
Hard disk - 320 gb

 

[Borek]

It can be (almost) everything. Disconnect HDD, CD/DVD/BlueRay, and see if it still restarts. Disconnect any external devices that are not necessary. Try replacing mouse and keyboard. Enter BIOS and disable LAN/WAN. You can even try to remove RAM and see what is happening. This way you will at least eliminate some possibilities.

 

[jedishrfu]

on startup do you hear any beep codes? They can tell you what may be wrong.

http://www.computerhope.com/beep.htm