Re: Is a new PSU the answer
No, I don't think that's a power problem, not unless it's a reoccuring problem. Now, it sounds more like hardware failure, seeing as you no longer get anything. What exactly is "normal startup" for you? Like, do you get a beep and then hear the harddrive thinking/see the light flash? Do you hear it go to windows?
I'd say try another video card if you can.