Posted 23 February 2011 - 10:42 AM
Well, it could be anything from a bad graphics card to the hd, ram, mobo, etc. It's just impossible to diagnose based on what we know so far. Here are some things you can try:
1) If you have another video card lying around, give it a shot.
2) If you have an original XP CD, boot to the recovery console and run chkdsk /r. If not, download the diagnostic utility from your hd mfg's website, burn it to cd, boot to it and run it
3) Download memtest (www.memtest.org), burn it to cd, boot to it and test the ram
The fact that there are NO beeps made me think it was the power supply at first, but you said all fans are running and the lights are on - so that's probably not it. If it IS a bad video card, that should generate a beep code - so that's probably not the problem but still, no harm in checking if you have a spare. Sorry to be so vague but again, it's just difficult to be more precise with the given facts.