This seems to happen most often with Macs that have used HDMI output to a display or TV which has speakers. Why does this happen? It’s probably a simple bug where a different audio output channel gets selected or chosen during the installation or update process. Do note that you may need to first choose “Internal Speakers” and then select the external speaker or headphones to get the audio output to work again as intended. * If you have external speakers or headphones hooked up, you’d want to select those instead. Adjust the sound as usual, it will now work as intended.Select “Internal Speakers” as the output device*.Head to the Apple menu and choose “System Preferences”, then select the “Sound” panel.And yes, this applies to all Macs with all forms of speakers internal, external, headphones, earbuds, etc: Here’s how to quickly fix the missing audio output on a Mac. How to Fix Audio and Sound Not Working on Mac If you have already ruled that out, proceed with the next simple troubleshooting steps. Sometimes the Mac is simply muted, which obviously when mute is enabled the audio output will not work and sound will not play. You can toggle the mute button on a Mac keyboard or use the Sound control panel to boost audio all the way up to make sure the Mac sound volume is not on mute. First things first: make sure the Mac audio output is enabled and that the computer is not set to be mute.
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