Just one thing I found out on mine while building it. I have the 120W so it may be different. The harness coming off of the PS has 4 spots that arnt connected to the ps. These 4 are for the 12v P4 adaptor. Having a P4 MB, The fans ran, but nothing else. I got one of THESE and it booted up fine. But if you are saying it ran before... uh oh and good luck
I sorta felt dumb after it heh.