I just put in some new fans, redid my power wiring and IDE wiring. I tried to start the computer. I got to post and everything is working fine and the computer just shuts off by itself about 15 seconds into the post.
I unhooked the fans and optional things like fan controllers and left the essentials in. The same deal, except it got about 20 seconds into the post.
I think his psu is dead or dying, but im not sure.