jeudi 22 janvier 2015

Disable yosemite startup sound


How can I permanently disable the startup sound (or chime) in Yosemite?


(I am using a late-2014 13" macbook pro)


I already tried several options found here and there :




  • installed StartNinja.app => did not work




  • installed Auto-Mute.app => did not work




  • tried to install the old StartupSound prefPane => did not work




  • tried the command "sudo nvram SystemAudioVolume=%80" => volume does not change (I also tried other values than 80, such as 00, 01, or nothing)




NOTE: I know that it is possible to mute the next startup sound by turning the volume down, but this is not a permanent solution.





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