Q: Note: "Bluetooth offline. Restart your Mac. If the Bluetooth status doesn’t change, disconnect all USB devices and restart your Mac again": if not successful, shutdown and remove / replace the battery
TIP: In case Bluetooth is offline and restarting with USB devices disconnected still does not solve, shutdown, remove / replace the battery and restart.
MacBook, OS X Mountain Lion (10.8.2), MacBook 13 end of 2008
