Internal Sound Issue Macbook Pro

Joined
Oct 19, 2011
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So I turned my computer off today and the sound isn't working, I don't know the reason, Worked fine yesterday. So when I go to preffs. and look for the internet sound output it says no units found? There is suppose to be something marked there but I don't know how to find it.

There is a sign that looks like an O with a line above it, One like the STOP sign. When I try to mute or un-mute it works but the stop sign is there preventing me from hearing anything, I would apreciate any help.

Example Picture: http://www.google.se/imgres?q=mac+s...3&tbnw=156&start=0&ndsp=18&ved=1t:429,r:0,s:0
 

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