Power-off problem

[CBeTHaX]

Hi, I don't know if the topic is in the right place, but I have an emergency problem. My old computer(AMD Sempron 2800+ ; 160GB HDD ; 512mb ddr2 and etc.) is turning off no matter what I do. When it is turned off for a while and I turn it on, it stays on without powering of for about 30 minutes. Then when I turn it on it stays 5 minutes and powers off. I tried to reinstall windows XP, formated the whole hard disc , and there was still a problem with powering off. The strangest thing is that it stays longer when i move the mouse repeatedly. When I play games it doesn't power-off but when I stop playing it powers-off 2 mins after that. I recently installed Ubuntu Linux and it wasn't having that power-off problem(but in BIOS or when I install windows - there it is again).
I hope my english isn't very bad because I'm from Bulgaria

 

[akhilles]

Keep this handy for getting the specs of a pc:

http://www.cpuid.com/pcwizard.php

List the specs.

Does it cut off power in split second or does it shut down with "Windows is shutting down..."?

 

[WR2]

Check your XP Power Option properties

Click on the Windows 'Start' button
Click on 'Control Panel'
Double-Click on 'Power Options'
Power Options dialog box will open.

You (or someone else) may have changed the power saving options.

 

[CBeTHaX]

The temperatures of the CPU and the Motherboard are about 30-35 , and that picture - everything is set to never.