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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