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How to disable the startup tone on your Mac
https://www.idownloadblog.com/2016/09/12/how-to-disable-the-startup-tone-on-your-mac/#:~:text=1%20Launch%20the%20Terminal%20app%20on%20your%20Mac.,and%20press%20the%20Return%20key%20on%20your%20keyboard.
Question: Q: How to reverse: sudo nvram SystemAudioVolume ...
https://discussions.apple.com/thread/6741774
Answer: A: Run the following: sudo nvram SystemAudioVolume=%26. (118856) More Less. Posted on Dec 25, 2014 11:40 AM. View answer in context.
How to Disable the Boot Sound (or “Startup Chime”) on a …
https://www.howtogeek.com/260693/how-to-disable-the-boot-sound-or-startup-chime-on-a-mac/
How to View & Clear the Mac NVRAM Contents from …
https://osxdaily.com/2015/12/16/view-clear-nvram-mac-command-line-osx/
Mac startup chime: How to make it work or ... - Cult of Mac
https://www.cultofmac.com/686749/how-to-resurrect-your-macs-startup-chime/
macos - How to permanently disable the Mac startup sound ...
https://apple.stackexchange.com/questions/431910/how-to-permanently-disable-the-mac-startup-sound
sudo nvram SystemAudioVolume=%80 sudo nvram SystemAudioVolume=%01 sudo nvram SystemAudioVolume=%00 sudo nvram SystemAudioVolume=” “ After each command, I did a shutdown of the Mac, and started it up again (no reboot). In all 4 cases, the startup sound was still played after I turned on the Mac. How to permanently disable this sound?
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