To permanently disable the startup sound so it isn’t played at startup, even if you have your volume level set to maximum volume when you shut down, you need to use a terminal command. How to Permanently Disable the Startup Sound If you don’t have a Mute key on your keyboard, you can always just set the volume slider to the lowest level it will go.
If you ever have to restart your Mac for some reason but you don’t want it making any noise, just do this. To disable the startup sound, just press the “Mute” button on your keyboard (that’s the F10 key on a MacBook) before shutting down or restarting your Mac. If your Mac was muted, the startup chime will be silenced. If your Mac was set to maximum volume level, the boot chime will be played at maximum volume.
Your Mac’s startup sound depends on the volume level your Mac was set to when it was shut down. How to Temporarily Disable the Startup Sound
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