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I recently upgraded to an 8800gtx and my system started up perfectly the first couple times. Yesterday I was just browsing the internet and my computer was randomly locking up for around 10 seconds, so I rebooted it. Upon reboot I got to the Vista load screen, that disappeared after about 10 seconds and it went to a black screen and froze. Its been doing that ever since. I tried booting into safe mode but that crashes while loading too. I'm a little confused but I think that my PSU might be the culprit here, I use a PC Power & Cooling 510w. After Vista crashes while loading I'll flip the power switch off in the back and it produces a loud half second beep. Is this a PSU problem or not? I need to know this before I go and buy a new one. Thanks 