Instructions for resetting the PMU NOt PRAM in Powerbooks when Apple Firmware update goes wrong:
Zapping the PRAM will not bring back your Bluetooth. You have to reset the PMU.(Power Management Unit) Mac OS X
PowerBook G4 (12-inch), PowerBook G4 (12-inch DVI), PowerBook G4 (15-inch FW 800), PowerBook G4 (17-inch) and PowerBook G4 (17-inch 1.33GHz)
1. If the computer is on, turn it off.
2. Reset the power manager by simultaneously pressing and then releasing Shift-Control-Option-power on the keyboard. Do not press the fn (Function) key while using this combination of keystrokes.
3. Wait 5 seconds.
4. Press the power button to restart the computer.
If you're like me and having awful trouble in Firefox these days, my friend Luke suggested that I reset everything in Firefox - here is the information on how to do that.