I am having a booting problem with my machine. It was on and running fine. I was opening an audio file that I had opened numerous times before, and it was taking a while so I left that room and when I came back to the room and it was off. I tried restarting and it wouldn't power up. The light flashed momentarily when pressed, and stays on if I hold it, but nothing else powers on; fans, drives, etc. I checked the power supply with a volt meter at pins 1 and 12 and received a 5 volt trickle of power which makes me think it's not the power supply. I've reset the pmu, tested the battery disconnected my secondary storage drive. Nothing seems to make a difference. Any suggestions???