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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.
 
If it works on another computer or device then something must be wrong with your iMac's port I'm guessing.
 
SOund check System Preferences

Go to System Preferences\Sound\Output.

Speakers should appear there
 
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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