I had the same problem yesterday and found your post this morning. I'm sure you figured out what was wrong by now, but in case anyone else has the same error message, here's what I found.
When I picked up the computer to look at cables and connections, I noticed a couple pins in the 1394 slot were touching each other. I bent them back to the default position, and tried booting up. Same warning, same shutdown. Not fixed yet.
Then I noticed a loose screw at the bottom of the computer, and wondered if something had been shorted by the screw being underneath the motherboard. Next to it was a blue jumper.
I got the motherboard manual and looked at the jumper settings. I noticed a USB voltage / power jumper setting where on my motherboard there wasn't any jumper. I put the loose jumper on in the default position, and Voila! Booted up fine afterwards.
May we all be so lucky...