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Mac OS X Lion: Sound problem after unplug… - Apple Community
https://discussions.apple.com/thread/3220787
Go to the Built-in Output and play around with the Format. For me, 2ch-24bit Integer works for both my headphones and the built-in speakers. Play around with a couple settings, you should notice an immediate change if it works. Q: Mac OS X Lion: Sound problem after unplugging my headset/headphones.
If the internal speakers on your Mac aren't working ...
https://support.apple.com/en-us/HT203186
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. If the Output volume slider is set low, move the slider to the right and test again. If the Mute checkbox is selected, deselect it and test again.
MacBook Has No Sound? Get Not Working Sound Back …
https://recoverit.wondershare.com/mac-tips/macbook-no-sound.html
The headphone jack on my MacBook Pro just stopped working ...
https://apple.stackexchange.com/questions/55243/the-headphone-jack-on-my-macbook-pro-just-stopped-working-how-do-i-fix-it
I'm not sure if it's a hardware issue for you; if you go under System Preferences → Sound → Output, you should see Headphones as one of the output devices. Most likely the audio is being directed to some other output device (like Soundflower or Boom). Just make sure that Headphones is selected.
MacBook Pro Sound Not Working [FIXED] - Super Easy
https://www.supereasy.com/macbook-pro-sound-not-working/
1) Shut down your MacBook Pro. 2) Press the Shift, Control and Option keys on the left side on your keyboard and the Power buttons at the same time. Then hold them for 10 seconds. 3) Turn on your MacBook Pro. This should reset the SMC on your MacBook Pro. Now check to see if your MacBook Pro sound works now. Hopefully one of the fixes above worked …
Mac sound not working? Here’s how to fix it
https://macpaw.com/how-to/fix-sound-on-mac
Go to System Preferences and choose Sound. Click on the Output tab. If there’s an output option that looks like a software app and it’s selected, that may be why the sound is not working on your Mac. The best thing to do in that instance is to uninstall the app.
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