It'll restart and sleep but NOT shut down

I've a system that won't shut down! When I select "shut down" from drop down, it'll go through the process but instead of shutting down it restarts. The only way to shut down the system is to hold down the power button.
The problem originated on a PowerBook G4 550 running 10.3.8 so I upgraded it to 10.4.8 but the problem still exists. I've tried disk warrior, permissions repair, and disk repair w/o luck. Any tips?

The problem exists even when there isn't anything connected to the Powerbook.
I've zapped the PRAM w/o success.

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