Make sure the external speakers are selected in the list.Choose Sound and then select the Output tab.There may be a red light indicating that something is blocking the port. Method 3: check the headphone jack for debris. Method 2: make sure the power switch on the external speakers is turned on. Method 1: check the connection between the external speakers and your Mac.
When You Can’t Hear Sound through External Speakers If still can’t fix the sound problems on Mac, please contact Apple Support. Press & hold Option + Command + P + R immediately for about 20 seconds.Method 8: reset the PRAM (Parameter Random Access Memory). Press the power button to turn on your Mac again.Wait for a few seconds and then reconnect the power cord.Press and hold the power button for 5 seconds and then release.Method 7: reset SMC (System Management Controller). Please start to recover Mac files immediately after you find they were deleted or lost during the update process. You can also set your Mac to check for software updates automatically. Follow the on-screen instructions to finish rest steps.Look for Software Update and click on it.First, you need to click the Apple menu.Method 6: update your macOS to the latest version manually. 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.
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