Help! PowerBook G4 will not shut down using normal methods!

Recently, my PowerBook G4 Aluminum (1.5/1.67 GHz) will not shut down. It has recently started doing this. When I choose any of the shut down, restart, log out items in the  (apple) menu, it will not bring up a dialog. Same with pushing power button. I have to do sudo reboot in the Terminal to make it shut off, or otherwise I can just hold the power button. Tried resetting PRAM. Recently downloaded a few apps. Can anyone help?
-The Mac Bot

It's been a long time since I've revisited this...
Reinstalled OS due to main account getting corrupted. Could not log in.
That did not resolve the corrupted account, so I booted up with command-S and issued a few commands to reset and force the Setup Assistant to run. That worked, allowed me to login and start fresh.
That did not solve the not shutting down problem.
I am able to "lock" the system (using MacLoc) and shut down from the login window.
Or if I have Fast User Switching enabled I can choose "Login Window..." from the menu, and shut down from there.
A long time ago, I edited a few .nib files inside /System/Library/CoreServices/loginwindow/Contents/Resources.
A reinstall replaced those files with the originals.
Still cannot shut down by pressing power button and clicking Shut Down, or choosing log out, shut down, or restart from the apple menu.
Important clue: If I press Shift-Command-Q (the log out hotkey) the window I am working with dims as if another window popped up, but no other window popped up.

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