I have a problem which has me beat right now. My PC has been dying soon after startup, within a few minutes. everything dies except the PSU fan and CPU fan, and the front power light, the power button doesnt work though. Screen dies, ctrl/alt/del doesnt do anything, power has to be cut off. Windows repair console running chkdsk /r says 'one or more errors on the volume have been repaired', but when restarting the problem re-occurs. Now the PC dies after the desktop comes up and during software loading. I have opened her up and dusted her out, as I thought it might be heat trouble, but makes no difference.
I tried a fresh HD and installed Windows on it, the same problem occurs during the finalization of Windows installation so that's no help. If I try to start in safe mode using the first HD sometimes it completes but the PC dies as soon as I touch the PS2 mouse, USB keyboard input is fine though. Other times the safe mode startup doesn't get beyond the line where it loads AGP440.SYS and says 'press escape to cancel loading SPTD.SYS'. Either way I can't get into Windows to run any software to check the problem. I managed to run a full Symantec virus check when the problem first started last week, as well as Webroot Spysweeper, both came up clean. My XP has been running fine for 2-3 years, SP2 has been installed for a long time, and all updates are installed. The PC has been stable for 2 years at least before this.