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When i try to reduce my mac book volume it suddenly shows that this isn't possible, even the icon in the menu bar is (grey inactive)

This happens sometimes since i installed lion os

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5 Answers 5

I have experienced this issue starting with my new install of Lion. I haven't been able to find the cause of the issue but I do have a quick way to reset the audio system and get back volume control.

Open Activity Monitor (Its in Applications/Utilities)

Make sure it is set to All Processes, look for coreaudiod, click "Quit Process" then "Quit". Wait a few seconds and you should have volume control back.

If your a terminal buff a quick sudo killall coreaudiod should whip it into shape.

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Check inside the headphone jack. Is a red light showing? If so, the MacBook might be trying to output optical audio. Make sure nothing is stuck in there - lint, dust, etc. Plugging in and then removing headphones may also help. If the red light stays, best to bring it in for service.

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The first thing to check is the selected output device in System Preferences. To do that, open System Preferences and click on "Sound".

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Next, go through each of the tabs to verify that you don't see any obvious settings. I've seen this before on Snow Leopard, and although I'm now on Lion, I don't think this changed much.

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I don't remember what the setting were, but it was fairly obvious to me what to change.

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When I had to use Force Quit to close a stuck Premier Elements 9, it somehow reset the audio. Go to System Preferences → Sound → Output and re-choose Internal Speakers to get the sound going again, as well as the buttons on the keyboard to control the speakers.

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As you suggested, I cHecked inside the headphone jack and found a red light showing. Plugging in and then removing headphones solved the problem. Thank you for the advice.

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