Just how do I disable or remove the startup appear my Mac makes?
Open Terminal.app and also type :
sudo - s
Give the password when requested for after that :
cat >/private/etc/rc.shutdown.local #! /bin/sh /usr/bin/osascript -e 'set volume with output muted'
after that press Ctrl - D and also type "exit". Next time you'll reboot in silence BUT you'll need to by hand reset the sound quantity (F10, slider ...) if you intend to listen to some songs once more. In theory it needs to be feasible to run under/ private/etc/rc. neighborhood a manuscript to do it (' set quantity without result silenced') yet that appears to act unevenly.
I have not seen that audio on my MacBook Pro for ages, and also today I identified why. The MBP appears to bear in mind 2 collections of quantity setups ; both for having - no - earphones - connected - in, and also for having - earphones - connected - in.
I generally have my exterior audio speakers connected in - when I'm at residence, and also when I'm travelling/way from residence clearly I do not. At some time in the past I have actually transformed the quantity to absolutely no when earphones weren't attached, and also currently when I start the MBP up there's no audio.
You can attempt this (though it's not specifically sensible) - turn the quantity on your Mac right to absolutely no, after that reactivate the computer system. I believe you will not listen to the startup - audio. Like I claim, not actually sensible yet if the start - up sound frustrates you sufficient, you could simply get involved in the behavior of transforming the quantity down prior to turning off. : -)
EDIT : Just knew this this factor concerning transforming the quantity down has actually currently been made in various other solutions below, so do not hesitate to overlook this!