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also, when i go to sound preferences and hit "sound effects" the mute box for the output volume is already checked and it won't let me adjust it or change it. it's grayed out...and i can't click on it.

I just got a new mac about a week ago and the sound has already gone out. I didn't do anything weird, that I can think of, it's just not outputting sound. whenever i press the f11 and f12 buttons to adjust the volume, a circle with a line through it appears. In my system preferences i put that i...