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I would like to config my Mac (10.8.5) to turn the sound off every time I power it off so that when I power it back on it is silent and doesn't produce that funny boot sound. Can that be done?

The thing is, I come in to work late and, if I had the sound on before I turned the laptop off (e.g. watched YouTube at home) and forgot to turn the sound off before, my whole cube farm at work resonates and they are like "this guy just came in to work"... LOL

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up vote 6 down vote accepted

You can set the audio value on boot using this:

sudo nvram SystemAudioVolume=%00

00 will set to 0% volume (i.e. mute)

You can reset this by resetting the NVRAM by booting with ⌘⌥PR, or running

sudo nvram -d SystemAudioVolume
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is this a one time command that modifies a persisted setting (i.e. doesn't have to be execed in every session)? – amphibient Feb 5 '14 at 16:59
@amphibient This is a persistent setting, being set in the NVRAM. Providing you don't reset your NVRAM, this setting will remain. – grgarside Feb 5 '14 at 17:17
didn't work, i ran it as my admin but not superuser. should i run it as root under sudo? – amphibient Feb 6 '14 at 16:33
@amphibient Yes, you'll need to run it as root. – grgarside Feb 6 '14 at 16:34
actually, I take it back, i just went through my history and i did run it under sudo. i turned the sound on, then powered off, when i powered back on, the boot sound played. so it didn't work :( – amphibient Feb 6 '14 at 16:36

An alternative to turn off the startup sound is to use StartNinja.

You can download from here:

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What does it do - just act as a cover for the command in @grgarside's answer? – Mark Feb 5 '14 at 22:58
And the web page says it does to work with iMacs – Mark Feb 5 '14 at 22:59
this works with macbooks, I didn't test with iMac. I don't know how it implements the functionality. – Guido Preite Feb 5 '14 at 23:27

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