PowerBook won't shut down, restarts instead

Hello,
I've read dozens of post about shut down issues with the older PowerBooks, but I can't seem to find any tips for how to deal with my issue. Here's what's going on:
PowerBook G4 500Mhz, Airport Card, 512MB Ram. Nothing connected via USB or Firewire.
When selecting "shut down" from the Apple menu, the computer restarts instead. I can't shut the computer down!
Here's what I've tried so far:
- Wiped disk clean, reinstalled OS 10.4.9. Created new user.
- Removed Kingston 256MB Ram chip and restarted.
- Removed battery and restarted
- Repaired disk permissions
- Reset PRAM
Any help would be appreciated, since I can't sell this computer if it won't shut down.

If verify disk didn't show any problems, then repairing the disk may not change anything. Still, it would be good to have your system discs available for troubleshooting. Apple will allow you to make a safety copy of your discs, so if you want to leave the originals in a safe place and make copies to carry around with you, Apple allows you to do that.
Do you have a bootable clone? If so, you could boot from it and then repair your boot drive should you need to. Just an alternative if you don't have your discs with you.
Maybe I'm not clear on just what's happening. Does your computer completely shut down and then start up again, just as if you had hit restart? Or does it fail to completely shut down? If the latter, I am wondering if you have some process or open window that is aborting the shutdown process. You might want to check in Activity Monitor and see if there might be some hung up process. Be sure to select "All Processes" at the top.
Good luck!

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