I upgraded a bunch of components to my homebuilt system in February, but since then I have not been able to use my new gpu (gtx 580). first I bought a hd 6970, but whenever I tried to play a game, the screen would crash to black, and I would have to restart my computer. I thought it was a faulty card so I got a refund and purchased the gtx 580. Same problem, but now sometimes I get a bsod code on reboot saying nvlddmkm.sys has failed. since this made my computer basically unusable, I put my old card (a 9800gx2) back in and things have worked alright since then. Speaking to a friend, he suggested that my power supply may be failing (its about 3-3.5 years old, 1000w, and it feels very hot to the touch inside the case). It was hooked up when my old mobo died (the reason for the upgrade), and I don't know how to test whether or not it is failing. Also, today, I downloaded a new game (the witcher 2), and when I started playing it my surge protector/battery backup started beeping. according to the user manual for the surge protector, this means the "UPS is overloaded". I didn't want to purchase any more hardware without being sure, what do you guys think?