Select it and click on the read X button to end the process.Look for coreaudiod in the process list.Make sure the checkbox in front of the Mute option is not selected.(You can also press F12 to turn up the volume.) Please move the slider to the right side and test again. Go to the Output volume section and make sure the slider isn’t set slow. Look for the built-in Internal Speakers Please make sure it's selected.Select System Preferences from its submenu.Click the Apple menu (the Apple logo button) on your Mac.Method 3: shut down your Mac completely, wait for a few minutes, and turn it back on. Method 2: check the cables from the display and the ports on your Mac. Method 1: unplug any headphones or external speakers that are connected to your Mac. Read More When You Can’t Hear Sound through Internal Speakers
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