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