How to turn off Mac's sounds by default? In some situations I would open my macbook in a public place or library, and I still have something open that produces sound, such as music or a chat program giving notifications. I would like to have my sound be muted by default when I open the lid. Anyway to achieve this?
Have you tried muting the sound?



Muting the sound before closing the lid and/or rebooting will keep the sound muted.

I also found this: Mute volume of macbook on sleep