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Snow Leopard: Sound volume resets after rebooting Mac

Some users are finding that after rebooting their Mac, the previously changed sound levels have reverted to the default setting.

Some users are finding that after rebooting their Mac, the previously changed sound levels have reverted to a default setting. For some users the sound level is set at a minimum, while others report that the setting defaults back to fifty percent.

Apple Support Discussions user "Mccabbe" reports:

Hi, i upgraded my computers this week end (iMac, macbook, mini) from Tiger to Snow Leopard. All went great except one little bug : the sound volume resets at each reboot, for example on the iMac it is always at minimum after each reboot. This occurs on all 3 computers.

Another ASD user echoes the issue:

This Snow Leopard sound issue sure gets around. Mine stared some time after the initial SL install. I have since done a compete erase and reinstall with no charges to my sound issue which is;
I can set my system volume level to about 10% but when I restart or startup the iMac the volume level defaults to the 50% setting. I have tried all the suggestions within this post with no fix. Applecare has no idea.

The issue seems to lie in a corruption of the audio preference files in Snow Leopard. To alleviate this problem, navigate to the preference files and move them to the Trash.

Macintosh HD > Library > Preferences > Audio

The files will be:

  1. com.apple.audio.DeviceSettings.plist
  2. com.apple.audio.SystemSettings.plist


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