Start up sound control for OS10.9.2

[Greycat]

How do I kill the start up sound in my iMac? It keeps resetting itself.
Thanks,
Gc

 

[Cory Cooper]

Hello and welcome.

You can use the following commands in the Terminal app.

1. Open Terminal app in Utilities folder
2. Copy and paste one of the following at the prompt (depending on what you want to do) and press Return key
3. Enter your user login password when prompted and press Return key
4. Restart your Mac to verify

Disable Startup Chime

sudo nvram SystemAudioVolume=%80

Reset Startup Chime to Default

sudo nvram -d SystemAudioVolume

Let us know if that doesn't take care of it.

C

 

[Kaveman]

this is not a good thing to do as the startup sound gives important diagnostic information to service techs.

 

[Cory Cooper]

Correct, but any Mac technician would know to try resetting PRAM during initial diagnostics, which would reset the startup chime/speaker volume to defaults and allow the system to complete POST normally.

In addition, after testing this procedure, it only mutes the startup chime for one restart, it then returns to normal upon subsequent restarts/startups. The OP could also simply mute the system volume each time before restarting the Mac.

C