Mute the Mac Boot Chime with StartNinja...
A free and simple utility that gives users the ability to disable the startup chime, StartNinja will keep the Macs boot sound quiet while allowing the Mac to retain normal sound function otherwise.
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StartNinja
Macs don't have a built-in way to mute or silence the system start up chime. If you�re in a library...
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StartNinja Silences Your Mac's Startup Sound with the Flip of a Switch
It couldn't be any simpler to use. If you want your Mac to stop chiming when you boot it up, open StartNinja and set the switch to "off". If you want to turn the startup chime back on, switch it to "on". That's it. Pretty easy, huh?
It couldn't be any simpler to use. If you want your Mac to stop chiming when you boot it up, open StartNinja and set the switch to "off". If you want to turn the startup chime back on, switch it to "on". That's it. Pretty easy, huh?
MacWorld
OSX Hints
StartNinja turns off the system start up chime StartNinja turns off the OSX Lion system start up chime / sound. It is a free utility that you can download here. There are often times when I am in a public location and forgot to turn off the sound on my MacBook. Subsequently, a loud bong happens. Now there is a quick and easy solution for OSX Lion machines; StartNinja.