Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I upgraded my Mac to 10.8 yesterday when it was released and the update has caused my MacBook's volume keys to become non-functional, although I can still change volume through the icon in the menu bar or through system preferences. When I press the keys to change the volume, the transparent volume icon appears on the screen with a circle-slash icon at bottom center. Does anyone know how to make the keys functional again?

share|improve this question

closed as too localized by Oliver Salzburg Jul 27 '12 at 12:13

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

Which audio adapter is selected in your system preferences, or when you hold Option and press the volume icon in the menubar? – slhck Jul 26 '12 at 18:19
Not sure what you mean by "audio adapter". The output device is set correctly to internal speakers. – Gregory Jul 26 '12 at 19:21
i am also encountering this same thing. – corprew Jul 26 '12 at 22:21
For future reference, it's likely that restarting just coreaudiod instead of your Mac might help. Try sudo killall coreaudiod – Soumya Apr 27 '14 at 6:57

The "circle-slash" means that it's muted. Do you have a mute key on your keyboard that you can press to toggle mute, or can you manually unmute it in settings?

share|improve this answer
It's not muted. When I press the mute key, the effect is almost the same as with the volume adjustment keys, the only difference being that the transparent speaker icon has a slash through it, indicating mute (although the key does not mute or unmute the sound). That mute icon has the same white circle-slash at bottom center as the volume adjustment icon. – Gregory Jul 26 '12 at 19:24

The issue resolved itself after I rebooted.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged .