iMac startup sound

I want to stop the startup sound. Could someone please tell how I can achieve this, plug the headphones does not work.

I am the owner of the computer and I want to control it, I spent a lot of money on a computer that wakes up the whole family.

Applications-> utilities-> Terminal

sudo nvram SystemAudioVolume = 80%

Password: your password; It will not, resonate but enter anyway and then the return key >

<Re: How can I disable startup sound? >

<Re: mute start permanently>

<Re: how to disable or turn off sound Mac startup chime? >

Tags: Mac OS & System Software

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