I've been having the occasional BSOD, it doesn't seem to have any degree of rhyme or reason, except that it usually happens when I'm watching a youtube video/browsing the web, or playing a video game. System specs: ASUS M2N-sli deluxe mobo AMD Athlon 64 X2 3800+ socket AM2 2 Gig OCZ DDR2 SDRAM 800 Mhz Nvidia 8800 GTS 640 MB SeaSonic S-12-500 500W PS 2 hard drives (both western digital) DVD/CD burner. What initially made me think that this was a power supply issue is because I used to have an nvidia 7900gt, but it eventually died (and I had an occasional freeze or two similar to what I have now). I had an 8500gs in the interim, and I didn't really have any blue screen issues. Now, with my 8800 gts, I get these occasional blue screens again. Is my power supply sufficient for this situation? I'm trying to rule out which pieces of hardware could be causing the problem. As an additional note, the type of freeze would usually be a hard lockup, with the sound stuttering on whatever was playing last, and the video image frozen on what I was playing/watching.