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If the internal speakers on your Mac aren't working ...
https://support.apple.com/en-us/HT203186
Check your sound settings First, disconnect any cables from the USB, Thunderbolt, or 3.5mm audio ports on your Mac. From the Apple menu , choose System Preferences. Click Sound. Click the Output tab, then select the built-in speakers. If you don’t see built-in speakers as an option in the Output window, contact Apple Support.
No Sound Output on MacBook Pro - Apple Community
https://discussions.apple.com/thread/6043304
- open system preferences > sound and check 'output' to see if your internal speakers are listed - check they aren't muted! (mine didn't appear appear at all, no output did so I'm afraid I can't guide you further)
MacBook Has No Sound? Get Not Working Sound Back …
https://recoverit.wondershare.com/mac-tips/macbook-no-sound.html
Solution 1: Check the hardware and other connections For instance, speakers or headphones should be connected properly. You can disconnect all the peripheral devices from your Mac and connect them once again. If the headphones or Bluetooth devices are not working, then try to play something on the ...
SOLVED: No audio, and no "Internal Speakers" in ...
https://www.ifixit.com/Answers/View/376339/No+audio,+and+no+%22Internal+Speakers%22+in+SystemPrefs%3ESound%3EOutput
checked System Preferences->Sound settings: nothing showing up under the Output or Input tabs (no "Internal Speakers" showing up) NO RED LIGHT coming from headphone jack... so it's not the optical speaker switch problem most people seem to have.
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