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How to boot silently?

post #1 of 4
Thread Starter 

Pretty annoying to get this big sound DOOOONNG when you start the macbook, especially in the middle of a class or in a silent library.


Any clue on how to turn it off?



post #2 of 4

By having your audio turned all the way down at boot.


Or you could try this, but it's old and by just some random guy.

post #3 of 4
The best way I find is to run the following command in the terminal, which seems to put it on the quietest setting:

sudo nvram SystemAudioVolume=" "

That's a space between the double quotes. Some people suggest different values to disable it like the following but the space is the only value I get to work consistently:

sudo nvram SystemAudioVolume="%80"
sudo nvram SystemAudioVolume="%00"

It would be nice if it just accepted integers e.g 0-3. To reset it, you can either reset the PRAM with command-option-p-r at boot or with the following:

sudo nvram -d SystemAudioVolume

I've noticed that sometimes plugging in and unplugging earphones resets it, which could be why people have made preference panes etc but try it and see. I don't mind the noise being separate from the audio system but there's no need for Apple to make it so loud.
post #4 of 4
Thread Starter 

Thank you Mavericks.

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