HT204448: About the OS X Mavericks v10.9.2 Update
Learn about About the OS X Mavericks v10.9.2 Update
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Helpful answers
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Apr 22, 2014 1:47 PM in response to siriusmuzby Carolyn Samit,The upgrade may have reset to default settings ..
Check System Preferences > Sounds > Output
Make sure the correct device is selected and the Mute box is not checked.