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2016 MBP 13-inch 4 Thunderbolt 3 ports running macOS High Sierra version 10.13.6

All of a sudden, my sound isn't working, and using the volume buttons show a mute icon with a stop sign underneath. In my sound preferences, it shows no output or input devices.

Running system_profiler SPAudioDataType in Terminal gives this output:

Audio:

Devices:

Sound Preferences showing no output devices found message

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    It appears your audio hardware has failed. First thing would be to run AHT - Apple Hardware Test. Hold D while booting from a powered off state with the AC adapter attached. If no errors, then try in Safe Mode (hold Shift while booting).
    – Allan
    Aug 17 '18 at 2:37
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    I shut down my Mac, then turned it on and held down the D key. A list of languages showed up, and I selected English and pressed enter. A progress bar came up and it said Checking your Mac... After it completed, it said that no issues were found. After restarting back into normal mode, it seems to have been resolved and everything is back to normal now. Thank you very much!
    – Abraham
    Aug 17 '18 at 2:46
  • restart + D worked for me as well.
    – Merlin
    Apr 15 '19 at 15:44
  • This also worked for me (restarting without holding D didn't work).
    – xji
    May 12 '19 at 8:06
  • Restarting and doing the hardware test worked for me when a normal restart didn't as well.
    – Antimony
    Jul 13 '19 at 0:05
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Reboot the computer and hold D to run the Apple Hardware Test. In my case, it said no issues were found, but after rebooting, everything started working again. Based on the comments, many others have had the same experience.

Thanks to Allan for suggesting the hardware test.

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    I don't know how it can but this solved my problem too
    – Dr. aNdRO
    Jul 25 '19 at 4:36
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    Lo and behold! It worked! I guess the diagnostic tool will somehow magically correct whatever was messed up in NVRAM which prevents the driver from recognizing the sound chip.
    – anttix
    Nov 1 '19 at 15:04
  • Did all these resetting nvram, smc , D. Even after removing headphone it shows only headphone in output. 🧐
    – Na Ran
    Sep 6 '20 at 14:57
  • Sadly a restart is not THE solution! Apple is doing nonsense! Customers are paying thousands of dollars to get a reliable device while they can't even fix this issue! I have to reboot my mac during a meeting because I can't hear any sound anymore. Or I have to plug in my headphones or connect to a Bluetooth device. This is not okay Apple!
    – Hassen Ch.
    Dec 24 '21 at 14:21

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