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This question already has an answer here:

My headphone jack and my speakers are not working at all. They just randomly stopped when my macbook air was closed. Is there any system preferences that i need to change?

marked as duplicate by grg, Graham Miln, Ian C. Oct 24 '14 at 16:31

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • What are your current audio settings in System Preferences > Sound? – Stan Hutcheon Oct 24 '14 at 15:56
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The solution is from here and it worked with me:

There seems to be a bug whereby if the headphones are plugged in when the MBP is put to sleep and are not present when it is rewakened, the headphones stop being recognized. The solution is to:

  1. Unplug the headphones
  2. Put the MBP back to sleep (close the lid; without an external display hooked up)
  3. Plug the headphones back in
  4. Wake the MBP by opening the lid.

This should fix the problem.

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