On my Mac Mini the headphone jack only outputs the right signal. Can you replace the headphone jack? If so how do you go about it and what does it cost?
I would take a wild guess as to you needing to buy a new logic board as its soldered on, you could risk wrecking it further by soldering a new one on if you can find one to fit, but my suggestion is you buy a usb sound adaptor something like this...
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