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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?

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

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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. –  pyrogerg 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 at 6:57
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2 Answers

The issue resolved itself after I rebooted.

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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?

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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. –  pyrogerg Jul 26 '12 at 19:24
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