Pick out your speaker options manually to circumvent this issue. As you may have guessed by now, macOS - especially when it is loaded onto a computer that’s connected to HDMI speaker systems - can get confused about which speaker to automatically pick. In the Output list, you should see options for all these devices, as long as they are connected. “What about my headphones, external speakers, or Apple TV?” you may be asking. This should restore audio to your native Mac speakers.
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