Mac OS X: Loss of Sound After Waking From Sleep

After installing or updating to Mac OS X 10.1.2, there may be no sound after your computer wakes from sleep.
Symptom

Visual feedback indicates you have changed the volume when you press the volume keys on the keyboard, but you do not hear any sound. Applications that should produce sound do not.


Solution

You may address the issue by updating to Mac OS X 10.1.5 or later.
Published Date: Oct 10, 2016