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Ok im not stupid, i tried both those things. The volume is up and it works fine with my iPod, and this is a 3.5mm jack. Why isn't it working with my iMac
 
There is no way i screwed up the plugs, they can only fit in one place. And theres three plugs including the 3.5mm cable, its a 2.1 system btw.
 
They don't appear in system preferences. And are they supposed to be sticking out a bit? cuz i can't push them in anymore
 
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