So, you rebooted your Mac and now it’s missing its Bluetooth module? Try rebooting first. If that doesn’t solve the problem, here’s what to do:
- Shut down your Mac. Fully power it off; do not reboot.
- Startup the Mac.
- As soon as it begins to power on, hold Command+Option+P+R. All at the same time.
- Continue to hold until the Mac restarts on its own.
That’s it. You’ve successfully reset the PRAM and the Bluetooth should be working… If not, time to visit the Genius Bar.