I think I'm hosed - PC won't boot, won't even power on. Couple days ago I tried to start it up and the power was turning on and off, then thought I smelled something burning. So I pulled the power cord. Thought it was the power supply, bought a new one, hooked it up and nothing. Power won't turn on - nada. I'm thinking my MoBo is toast. The computer is about a year old at this point. Thoughts?