Bluetooth: Not Available / PRAM RESET does not help

I can see that many people have been having issues with BLUETOOTH going off-line since the last software update, but the solutions are working for me.
I have restarted x2, resetting the PRAM, but the problem persists.
Also, BT is not showing up in the system preferences, however when I search for it in Spotlight, it says it's there. I attempted to reload the BT app but the installer won't allow it since it thinks I already have the most recent version installed.
HELP!
iBook G4 Mac OS X (10.4.6)

I have one of the last PowerBook G4 15" 1.67Mhz. Everything is fine except Bluetooth, which works for a while then drops out. I'm using an Apple wireless mouse and keyboard, which work fine on several of the other Bluetooh-enabled Macs here, which include several G5s, towers and iMacs. On this unit, the Bluetooth icon will disappear from System preferences. I have to restart to get BT working again. Systen Profiler says I have Bluetooth but that it's "disabled." When I run the Bluetooth Firmware Updater, it says there's no Apple Bluetooth installed! I've paired the same Apple peripherals with a Powerbook 15" running Panther (X.3.9) and that unit runs BT fine.
The unit has been back to Apple twice, both times replacing the logic board, along with the Bluetooth card. Probelm persists. I've done the usually PRAM zapping (waiting for 3 chimes), reinstalled the operating system, etc. The problem persists. I've seen postings here and there that suggest there's a Bluetooth bug in X.4.6 with the Powerbooks. Apple should acknowledge this and fix it.
I continue to call Apple about this and they blow me off. Any other ideas?

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Bluetooth: Not Available / PRAM RESET does not help

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