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Jan 15, 2015 2:33 PM in response to fabiofromoutremontby Tony Schountz,I'm having a similar problem and have tried the things listed in the ACD page (LED Cinema Display (27-inch): Intermittent loss of audio - Apple Support). I have sound when I send or receive email, and in iTunes, but no sound when pressing the mute or increase/decrease volume keys (even though the screen icons appear) or by changing the volume sliders from the menu bar or the Sound pane in System Preferences. Ugh. Yosemite has been one pain in the backside.