12" PowerBook, Bluetooth device suddenly disabled?

[Steve Meister]

When I first received my 12" PowerBook, the Bluetooth menu appeared 
normally. Later, I think it might have been after the update to OSX 
10.2.6, the Bluetooth menu icon was grayed out, with a zig-zag line 
through it, and only one grayed-out option is present in the menu: 
"Bluetooth: Not Available."

Similarly, when I try to run the Bluetooth Setup Assistant, the 
Bluetooth File Exchange, or the Bluetooth Serial Utility, I get the 
message "No Bluetooth Hardware Found". I know my PowerBook came with 
built-in Bluetooth, and I know that the Bluetooth menu used to have 
items in it, so I'm not sure what happened.

Any ideas?
- Steve