My powerbook (with an extra monitor) is haunted

Ok, here goes
About a week ago I bought a nice 19" LCD display to go with my powerbook. I had no issues with it until last night.
When I turn off my computer it shuts down happily enough, but then it starts right back up again. This doesn't happen when I unplug the monitor from the computer. The monitor doesn't even have to be turned on.
What's going on?
Powerbook G4 15   Mac OS X (10.4.6)   128 MB VRAM

Ok, problem solved... sort of
I went out and bought a DVI cable to clear my mind. I didn't want something to be wrong with my computer and I didn't want something to be wrong with my new display. So I blamed it on the adaptor/VGA cable combination. The new DVI cable works just fine (it ought to after what I spent on it) and now my computer will stay off.
Granted there may still be something wrong with the computer, but now that I'm going digital to the display it doesn't seem to affect anything.
So, the problem, while not completely understood, is now resolved. I'll probably be frowned upon for treating the symptom without understanding the root cause, but it stumped the applecare guy as well so I don't feel too bad about it.
Well Ned, thanks for sticking with me on this. I guess we can chalk it up to poltergeists after all.

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