Any computer dudes out there?!?! Help!

If you replaced the mobo, did you ensure that none of the posts the old mobo uses to mount to the case are in a different location than the new one, and one is touching the back of the mobo? Commonly will ground out system.

Remove mobo, CPU and memory from case and place on non-conductive surface to test.. shorting the connector where the switch connects will power on board. Did you repaste the CPU?

Grant