Well as a bit of a back story to my own "470 Experience". I had a 700W OCZ game extreme. I bought it 3-4 years ago, but had to RMA it about a year and a half ago. I set up the rig in my signature on it, and due to age and the power draw of my setup with it, I popped that PSU as soon as I attempted the first boot with it. I then slid in my 1KW Silverstone and it booted right up. So effectively in a year and a half, my 700W PSU wasnt up to the task at hand, I assume you are running into a similar image. I also understand you dont want to randomly throw money into parts. May I suggest borrowing a PSU, or if that is impossible, maybe grab yourself a $30 kill-o-watt meter to see just what is going on before you make any drastic decisions.