I've been running windows xp on my computer for about 8 months now with no problems. I have a amd athlon 64 3000, 1 gig kingston 3400 ram, bfg 6800gt video card, 160gb sata hd. Windows starts up, gets to the windows splash screen with the bar moving across while it loads, goes black, then reboots. This is an endless cycle. I can go into safe mode, which i did, to back up all my important documents and files. I really don't want to reinstall windows again so is there any other way to fix this problem? I believe the last time it was working was before I went on a trip for 3 days, left my computer on while it was downloading something, and came back to see my monitor black and not turning on. So i just turned off my computer and turned it back on, and that's when it started. I first thought it was a hardware problem, sent in my video card to get a new one, same problem. Ram is fine too, and didn't test my hd on another computer just yet. Any help would be greatly appreciated.