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  1. Internal speakers on MacBook Pro running Safari 14.0.1 have very low volume. Running the same video with Chrome and the volume is normal. Seems like the problem is with Safari, not the OS.

  2. Strange sound problem I have is that I have external speakers that behave oddly with High Sierra. Often, with any applications that play movie or sound, if I adjust the time in a movie, the sound will cut out. What I mean is if I move the progress indicater on any movie or sound application (even in YouTube), there is a chance that after I move the indicator, the sound will cut out completely.

    I can reach back and unplug and plug in the external speakers and that fixes it every time but it is annoying. Going to “System Preferences” doesn’t work once the sound is killed, unless I want to use the built in speakers.

    Anyone have any ideas on this?


  3. I had the same issues. Go to system preferences and click on keyboard. Uncheck the “Use F1, F2, etc. keys as standard function keys then try it out.

  4. Fixing Volume Control Issues:
    sudo killall coreaudiod
    sudo kextunload /System/Library/Extensions/AppleHDA.kext
    sudo kextload /System/Library/Extensions/AppleHDA.kext

  5. I had the same problem: all of a sudden I was unable to control the volume on my iMac with the keyboard. When either up or down volume keys were pressed, the volume wouldn’t change, and a small, temporary window would pop up on the screen with a speaker icon under which was a tiny circle with a slash through it. I opened sound in system preferences and simply moved the slider at the bottom just a bit. Voilà! Volume adjustment was now working properly.

  6. Very interesting. I’ve learned something today. What if on SystemPreferences/Sound/Output there’s no device to select. That happened after an electricity failure during a storm just after a lightning. The house fuses went down. After reconnecting them everything start to work but Output sound devices disappeared. What’s todo? Thanks.

  7. The sudo killall did not work, but the reset PRAM did, but as I rarely use the MacBook keyboard I had to guess which one was the OPTION key.

  8. The 1st one didn’t work and the other are too hardcore to try.
    I used this instead, perfectly reset your audio drvier.
    In terminal:
    $ sudo killall coreaudiod

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