In "unplug everything," did you try removing the DVD and HD? I know you will eventually need the other in order to boot, but I have a feeling its one of the two. I've seen a USB external HD cause a machine to fail POST repeatedly.
If it doesn't fail without either, try adding one, and then the other. If the DVD drive works, try a live CD. If you've got another HD, try that one. You should start with MB+CPU+RAM, NOTHING ELSE.. no pci, no agp, no ports, no mouse, no HD, no DVD and work your way up one peripheral at a time.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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