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原帖由: jkbmjp ,

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I have the same problem.  Macbook Air mid 2012 running High Sierra and ran AHT but found no issues.  Under Output it lists Airplay as available but volume icon is greyed out. At the bottom, the Output volume is greyed out and the MUTE button is checked and greyed out.  I reseated the internal speaker cable. I tried SMC and PRAM but didn't fix it.  I connected  headphones to it but didn't trigger anything.

I think the logic board is bad despite everything else working ok.

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