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shut down the Mac. Restart holding down the trackpad.... worked for me.


Based on this iFixit guide (see step 13), you seem to have disconnected the subwoofer/right speaker cable incorrectly, damaging the socket in the process (supported by this diagram on page 185 of the Apple Technician Guide of the logic board, labels working counterclockwise from the top right.) Page 113 of the same guide details how to properly remove ...

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