Turn off Mac boot up sound

How to disable your Mac's startup sound in OS X

Here's how you can turn off the sound your Mac makes when it boots up. 1. Open a terminal window. 2. Type in the following command, then hit Enter. sudo nvram SystemAudioVolume=%80 3. Type in your password. 4. Restart your Mac, the boot up sound will be off. 5. You can turn the sound back on by using this command. sudo nvram -d SystemAudioVolume

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Silence Your Mac Boot Startup Sound Altogether | Cult of Mac

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