Maybe the powersupply is fooked? when under load, it draws more power from the PSU and it cant handle it?
can u test with a diff psu?
(i know its annoying.. but itl strike another problem off the list)
btw
Right click on My Computer, click on Properties, click on Advanced, click on Settings under Startup and Recovery, take the check out of Automatically Restart, click OK. Reboot your system
when it crashes, it could come up with BSOD and give you an error, write it down and post it here if u get BSOD.
Edited by Keith Chegwin on 09/07/08 8:50pm