Recently, my Macbook Air (Mac OS Sierra) ran out of batteries. When I tried to turn it on, the screen was all black so I shut it off. When I turn it back on, the headphones don't work. I've tried to open Audio MIDI Setup, but it shows this: Boxes unchecked and sound up

Boxes checked and sound muted

As you can see, the boxes are unchecked when the volume is up, but they are checked when the volume is muted. Either way, I cannot hear anything through the headphones.

P.S.-- I've tried this before, but I don't remember what I did.

  • I may have just broke my headphones. I'll get a new pair and check to see if they work. – anonymous Feb 8 '17 at 12:28

The headphones were broken; try different ones.

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