There were also one or two PowerBook models that used a rendition of the Twilight Zone theme.
However, there’s no reason for the chimes to be set so loud.
Nevertheless, the process is easy, if a bit convoluted.
LaunchSystem Preferencesby clicking on its Dock icon, or selecting theSystem Preferencesitem in the Apple menu.
In the Sound preference pane that opens, click theOutputtab.
SelectInternal Speakersin the list of Output Devices.
Move theOutputvolume slider at the bottom of the Sound window to adjust the Internal Speakers volume level.
You’ve adjusted the startup chime volume, as well as any alert chimes that use the internal speakers.
Reconnect any external audio devices that you connected to your Mac.
Use Terminal to Mute the Startup Chime
There’s another method for controlling the startup chime volume.
Using theTerminal app, it’s possible for you to mute any sound played through the internal speakers.
LaunchTerminal, located at /Applications/Utilities.
Entersudo nvram SystemAudioVolume=%80.
key in your administrator password when requested to mute the Startup Chime.
