オリジナル投稿者： David Najman ,
Hi, I had the same problem - No audio, and no internal Speakers in System prefs > Sound > Output. The solution what helped me was easy: [quote]'''Press and hold the power button until it shuts down'''. You'll lose unsaved work in any open applications. Then press the power button again to turn on your Mac.[/quote] I tried simply restart before this, but restart wasn’t enough.