Help can't unmute in my Mac OS X Lion 10.7.2 (11C74)

how to unmute in my
Mac OS X Lion 10.7.2 (11C74)??

System Preference > Sound
At the bottom  there is a box after Output volume slider  tagged Mute.
Uncheck the box.
If that does not help Reset SMC.
http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
Best.

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