Hah.. this thread remiinded me of the time I blew up a power supply by replacing a video card.
Everything ran fine (for a while) but the fan on the card was screaming... "Wow thats noisy but it looks good so hey !!!"
After about 1/2 hour of play (Oblivion I think) there was a loud snap, a blank screen, and a silent computer.
After I cleaned my shorts I set out to find that he fuse in the inadaguate power had blown due to overcurrent
Put in a new (larger) power supply and that video card got a lot quieter !!!