Hi, When I came home today my step-sister told me that my pc wouldn't start anymore. She had been browsing the web a bit and then had left it on. About 3 hours later she heard a small 'pop' noise and the pc shut itself down. All that time no one had touched the PC. At first I thought it was a cap that had exploded inside the power supply, so I took it out and tested it. Well, it worked just fine, so I put it back in. When I press the power button, I can see the power supply start spinning for about 0.5 seconds and then it just shuts down and nothing happens anymore. I can press the power button as much as I want to, just nothing happens. When I remove the power chord and then plug it back in, it starts all over again: 0.5 seconds fan on, then everything shuts down again. Does anybody has any idea what could be causing this? The pc was working just fine, well, except for one blue screen saying something about an error in the registry, but that can't have anything to do with it, since the pc now can't even get to the POST sequence. Help!