How do I fix my Macbook Air's sound?

[iMore Question]

How to fix my macbook air's sound! It won't work when I play Youtube!

I just got this MacBook Air, and all of a sudden, when I try to play Youtube and I turn up the volume, it is mute. But, it says that the volume is up. Please help me!!

 

[iEd]

Re: How to fix my macbook air's sound! It won't work when I play Youtube!

What about the sound when anything else plays like a song in iTunes or alerts?


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