Sorry to ask, I searched and didn't find the answer (maybe not searching with the correct terms?)
Setup: Mini 9, internal bluetooth, 10.5.7, DellEFI method 3 (external dvd).
Both on the menu bar and in system preferences Bluetooth is "ON" and the option to click the box is grayed out. While I'm very glad that it is working I would like to be able to turn it off to squeeze a little more time out of the battery. I've run the "fix bluetooth" option in the DellEFI and that didn't seem to fix anything.
Found it. BT
Terminal mod...need to read more post less.