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How to permanently turn off your Mac’s startup sound - ChrisWrite…
https://www.chriswrites.com/how-to-permanently-turn-off-your-macs-startup-sound/#:~:text=1%20Open%20your%20Mac%E2%80%99s%20%E2%80%98System%20Preferences%E2%80%A6%E2%80%99%202%20Select,selected.%204%20Select%20%E2%80%98Show%20volume%20in%20menu%20bar.%E2%80%99
terminal - Has Unix Parameter Name SystemAudioVolume Been ...
https://apple.stackexchange.com/questions/367502/has-unix-parameter-name-systemaudiovolume-been-changed-to-systemaudiovolume-db-i
Firstly, the sudo nvram SystemAudioVolume=%00 (or the same command with different values at end) never allowed users to actually change the startup chime sound. In earlier versions of Mac OS X it did allow users to change the volume, and therefore they could mute the startup chime, but this did not change the sound.
How to disable the startup sound on Mac | Splaitor
https://splaitor.com/how-to-disable-the-startup-sound-on-mac/
How to disable or enable the Mac startup sound First of all, you should tap on the Apple button which is located on the left side of the Mac menu bar and then, you... After that, you should tap on the “ Sound ” button. To complete the process, you should tap on the checkmark next to the “Play Sound ...
Mac startup chime: How to make it work or mute it …
https://www.cultofmac.com/686749/how-to-resurrect-your-macs-startup-chime/
sudo nvram SystemAudioVolume=" "Changing all the time. And that’s about it for today’s chime-related antics. The ability to switch the …
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/
sudo nvram SystemAudioVolume=%80. Enter your password when prompted and press Enter. Restart your Mac and you won’t hear the sound. If you’d like to undo your change later and have the startup chime play normally when you boot your Mac, run the following command: sudo nvram -d SystemAudioVolume Help, the Command Didn’t Work!
How to permanently turn off your Mac’s startup sound ...
https://www.chriswrites.com/how-to-permanently-turn-off-your-macs-startup-sound/
sudo nvram SystemAudioVolume=%80. Press the ‘Enter’ key on your keyboard. Enter your admin password when prompted, and then press ‘Enter’ again. If the above command doesn’t work for your particular Mac, then try repeating the above steps, but replace the Terminal command with one of the following: sudo nvram SystemAudioVolume=%01
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