How to un-mute an iMac

The MUTE button is greyed out. I can not access it to un-mute. The F-10, F-11 and F-12 keys do not help. Any advice?

SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.

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How to un-mute an iMac

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