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Core Audio Service Glitch.
Your next step, based on what you observed.
1 · Choose a symptom2 · Check safely3 · Your next step
YOUR NEXT STEP
Sometimes the macOS audio background service (CoreAudio) crashes and stops sending sound to the speakers even if settings look right.
Open Terminal (Cmd+Space, type Terminal) and type 'sudo killall coreaudiod' then press Enter. This restarts the sound system instantly.
A symptom can have more than one cause. These guides help you choose a next step; confirming a hardware fault requires testing.
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