I can't remove the mute from my macbook air

I can't seem to get my macbook air off of mute, I turn it off and back on and still no sound.  Even when I am able to get the start up sound back, I still don't have sound when I play clips or anything else.

I have tried removing it from the check box in system preferences and I can't access the box it's grayed out.  I have also trued using the keys on the key board.

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