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I don't know if this is a bug or a feature in Mac OS X 10.7. Every time I (re)start my Mac the volume of my audio device is set to zero and doesn't remember the last level I set.

I think this started some weeks ago, maybe with a Lion update. I don't remember changing any audio-related setting.

Is this something I can change? I'm running Mac OS X 10.7.2 on a 2009 MacBook Pro which sometimes I connect to a 24" Cinema display (but it seems that the behavior doesn't depend whether it's using the laptop's or the display's speakers.)

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up vote 6 down vote accepted

I found the answer on AskDifferent's sister site

Snow Leopard resets sound volume whenever I start my computer

In Macintosh HD / Library / Preferences / Audio there are two audio setting files. Delete them. Set your sound to the desired setting. Restart.

This solved my issue.

Audio settings Mac

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Which files? I only found one file in Username - Library, and there's no Audio folder in Macintosh HD - Library - Preferences. – user54825 Aug 9 '13 at 22:30
@user54825 I added a screenshot that shows the the two files and the folder path. – splattne Aug 10 '13 at 8:26

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