My computer is one that I put together myself so when it breaks I am the only person arround to fix it. My computer had started acting funny awhile ago so I had been working on it for a couple weeks. Last night I was working on it and accidentally killed my PSU. (Don't ask me how) The computer turned off and the PSU started smoking. I hoped that all I needed to do was replace the PSU. Unfortunately it wasn't. When I switch on the PSU the lights on my case flicker on for a brief moment and then go right back off. The green light on my mobo is on but when I push the power switch nothing happens at all.

What all could be broken and need fixing?

good ? what were you working on when you fried the psu,sounds like and easy fix go out and buy a new psu and replace the old one ,