Disable Startup Chime in Sierra

[davvanc]

Running the old
code
sudo nvram SystemAudioVolume=%80
command in Sierra's terminal from the recovery partition, I get an error "command sudo not available" or the like, cannot remember exactly.
Anyway the once silent chime is back on my 2009 MacPro 4,1 flashed to 5,1.
Tried Onyx, which has that option in the Parameters section, no luck
Ideas?

 

[fisherking]

you can mute the audio before rebooting. or plug a cable (or just a miniplug) into the headphone jack so you don't hear it.

that terminal command (i don't know it), but %80? maybe look into this, perhaps %0 would mute it (again, am not sure).

 

[FreakinEurekan]

plug a cable (or just a miniplug) into the headphone jack so you don't hear it.

That won't work, I have a cable plugged into mine to a wireless transmitter to my hearing aids. Even if I haven't turned that on yet, the startup chime still comes through the iMac's speakers.

 

[fisherking]

how often do you boot up anyway? i assume you sleep your mac at night?

you could also try changing the sound effects settings in system prefs; for example, NOT play sound effects thru the internal speakers (not sure that would do it, just a thought).

 

[fischersd]

Running the old
code
sudo nvram SystemAudioVolume=%80
command in Sierra's terminal from the recovery partition, I get an error "command sudo not available" or the like, cannot remember exactly.
Anyway the once silent chime is back on my 2009 MacPro 4,1 flashed to 5,1.
Tried Onyx, which has that option in the Parameters section, no luck
Ideas?

Can you use sudo commands at all? (might be because SIP is enabled). I just did this on my Sierra system to test, the command was accepted fine.

To disable SIP, boot up in recovery mode, go to terminal and type

csrutil disable

(you can re-enable it after changing the parameter for SystemAudioVolume).

And, that command to mute the startup chime is taken right from the community forums guys:
https://discussions.apple.com/thread/4001727?tstart=0

 

[foxlet]

Running the old
code
sudo nvram SystemAudioVolume=%80
command in Sierra's terminal from the recovery partition, I get an error "command sudo not available" or the like, cannot remember exactly.
Anyway the once silent chime is back on my 2009 MacPro 4,1 flashed to 5,1.
Tried Onyx, which has that option in the Parameters section, no luck
Ideas?

You don't need to add sudo when in the recovery environment. Terminal starts in a root shell by default.

 

[davvanc]

Can you use sudo commands at all? (might be because SIP is enabled). I just did this on my Sierra system to test, the command was accepted fine.
To disable SIP, boot up in recovery mode, go to terminal and type
csrutil disable
(you can re-enable it after changing the parameter for SystemAudioVolume).
And, that command to mute the startup chime is taken right from the community forums guys:
https://discussions.apple.com/thread/4001727?tstart=0

I had SIP disabled before I updated the El Cap system, assumed that was the same. However, the update reinstated the SIP. So I disabled it, and reset the Sound parameters as someone suggested. Those were also reset during the update, I certainly didn't do it intentionally. So, after disabling SIP, resetting the Sound preference pane, and hitting the F10 key before rebooting, I finally got a quiet reboot. Hope that sticks! The 2009 MP4,1 flashed to 5,1 has always been a little strange in the way the nvram works, hard to explain as it varies from case to case.
Anyway, issue resolved(?) Thanks for your help everyone!

 

[Mamedoff]

https://github.com/teored90/nobootsound

 

[hwojtek]

Or just unplug everything from the computer (in case of a Mac Pro it means both front and rear audio jacks), select "Internal Speakers" in Sound preference pane, move the volume slider all the way down, restart.

 

[Andy Presovsky]

Running the old
code
sudo nvram SystemAudioVolume=%80
command in Sierra's terminal from the recovery partition, I get an error "command sudo not available" or the like, cannot remember exactly.
Anyway the once silent chime is back on my 2009 MacPro 4,1 flashed to 5,1.
Tried Onyx, which has that option in the Parameters section, no luck
Ideas?

I tried all the terminal commands, none of the helped.
And of course I always forget to mute Mac at shutdown.
After few months of being pissed off by Apple user unfriendliness, I found app on App Store called Auto Mute. It turns off the stupid boot chime.
Hope it helps.

 

[Tech198]

This may be done already, but he's another trick: (Attached)

should also work on HS too

Set volume, then restart Mac... Kinda fiddly if you still wanna hear sounds constantly raising and lowering the volume control, but it works too.