Resetting your Mac’s PRAM and NVRAM
Sometimes it is unfortunately necessary to reset your Mac. Recently Bluetooth stopped working on my MacBook Pro. The problem was fixed by resetting the PRAM:
- Shut down the Computer
- Locate the following keys: P R Command Alt
- Turn on the computer
- Immediately press P R Command Alt until you hear the startup-sound a second time.
For more information, see here.