I had some intermittent shut downs before the power supply finally totally crapped out. I have an HP Pavillion. I first bought a 750 watt supply from Tiger direct, but it wouldn't fit in my case. BUT, I did hook it up and make sure that the computer started up and ran ok. It ran fine. NOW, to replace that, the only thing I could find that would fit was a 350W diablotek. My problem is this, Now, when I hit the power button, the power supply fan turns on, but nothing else. When I turn it off, a power surge spins the cooling fan and the cpu fan. The side note would be that when I was putting in the power supply, the heat sinc was in the way. When I pulled it out, I didn't realize that the cpu came out with it. I jacked up the cpu when reinstalling the sinc. I bent some prongs. I have replaced it with the identical cpu and still have this problem. Any ideas??