1st
Go to System Preferences > Sound >
Set Output to Default
Make sure you don't just have your sound on mute
Set Output to Default
Make sure you don't just have your sound on mute
2nd
3rd
Your Speakers might just be dead, if so Rest in Peace
if dead speakers, you can just connect sound or monitor boxes to the mini-headphone-jack. There is another option called iMic, that is USB on one side and audio in and audio out on the other side. You can also try a USB-to-audio-jack stick which are advertised for PCs.
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