You may have been asked this previously but;
how do I turn off the startup sound on a Mac, my iMac to be precise. I managed to turn it down for quite a long time then with the latest update (to El Capitan) there it is again. What’s more none (well 4) of the so called fixes one finds on the net work any more.
I know the offensive sound is firmware based so I don’t want to mess with that, but I would like to at least turn it down, to 1% permanently. I suspect that Apple are hell bent on letting everyone in the library know a Macbook has started up and probably have someone dedicated to ensuring updates wipe out one’s modifications of this sort. I’m surprised Apple hasn’t made the Macbooks illuminated logo flash brightly on startup in unison with the loud boooooong.
iMac 27/5k model but our laptops(Sierra) need strangling also.