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"The system board displays a power failure (crowbar)": Is this a MB failure?

ProDesk 400

When I boot w/ my HP power supply, I get no error messages and no BIOS and no POST, but the computer just... sits there.  The CPU fan pulses on for a millisecond, and goes off again, and repeats that indefinitely.

 

I think this is a power failure of the MB, (the above quote is from the beep codes) but I'm not sure what the word "crowbar" means in this context.

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