Recently my MacBook Air stopped allowing me to adjust the volume. Whether I press F12 or F11 it shows a forbidden symbol on it, as in the picture below.

Volume Forbidden

After some research I discovered there is a mute button in System Preferences, and you are supposed to make sure that it isn’t muted. However I don’t have the option to unmute it.

No output devices found

Anyone know what to do in this case? I’ve restarted the computer several times but that didn’t fix anything.

  • Are you sure your speakers weren't damages in any way? – Skeleton Bow Aug 4 '17 at 15:21
  • Seems to be a somewhat known glitch with the Air, some more discussion here that might help: discussions.apple.com/thread/1736638?start=345&tstart=0 – calum_b Aug 4 '17 at 15:43
  • In the picture, it just shows the desktop and the command window - no menu bar, dock, or files on the desktop. Did you hide those for the purpose of this question, or are you logged into your computer differently? – DonielF Aug 6 '17 at 4:39

I've had a similar problem with other macs. Resetting my PRAM by pressing command + option + p+ r during reboot fixed the problem for me

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