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Audio not working on 27" display, Mac Mini

15021 Views 34 Replies Latest reply: Dec 15, 2010 3:26 PM by fox7 RSS
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atmcclain Calculating status...
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Oct 4, 2010 8:42 AM
I received my new display last week - was working great, including the sound. Now, I can't get any audio output out of the display at all. (Switching to the built-in internal speaker works fine, so I know it's not a general issue.) I installed the relevant software update soon after plugging in the display.

This seems like a software issue to me because some other things are weird. When the audio output is set to Display Audio, changing the volume up and down is very slow instead of instant. It actually takes a few seconds to register the up or down volume keypress. If I drag the volume slider in system preferences > Audio, I even see the wheel icon spinning for a while. Although no volume setting results in any sound output.

I restarted the computer and unplugged / replugged both the mini display port and the USB connection. Any ideas?

(The display part works fine, BTW!)

Thanks - ATM
Mac Mini (not the latest one but one generation previous), Mac OS X (10.6.4)
  • lacroixdesign Calculating status...
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    Oct 4, 2010 10:36 AM (in response to atmcclain)
    I am having the same problem. Has anyone else run into this and come up with a solution?
    Mac OS X (10.6.4)
  • reichea Calculating status...
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    Oct 4, 2010 11:33 AM (in response to atmcclain)
    Try this - it has worked for my sound issues with my new 27" ACD:

    Delete the com.apple.soundpref.plist from the MAIN LIBRARY>PREFERENCES - (not the users library PREFERENCE folder).

    Again, in the same MAIN LIBRARY>PREFERENCES folder, go into the AUDIO folder and delete com.apple.audio.DeviceSettings.plist and com.apple.audio.SystemSettings.plist

    Reselect the sound device you want as your default in the Sound Preference Pane.

    Restart your computer.

    None of this will harm your system, but hopefully it will solve your problem.
     Mac Pro Dual Quad Core Xeon, Mac OS X (10.6.4)
  • reichea Level 1 Level 1 (10 points)
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    Oct 4, 2010 1:38 PM (in response to atmcclain)
    Sorry to hear that. Do you have an Apple Store near you? I would take it there and have them test it, or maybe even take your whole system in and let them make it work for you.
     Mac Pro Dual Quad Core Xeon, Mac OS X (10.6.4)
  • fox7 Calculating status...
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    Oct 4, 2010 3:02 PM (in response to atmcclain)
    The following, restored audio for my new 27" display:

    - shut down your mac
    - unplug the power cord from the display
    ...wait 20 seconds...
    - plug in the power cord for the display
    - start up your mac

    -> audio should be restored to your 27" display
    MacBook Pro, Mac OS X (10.6.4)
  • pdxgoat Calculating status...
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    Oct 4, 2010 3:27 PM (in response to fox7)
    fox7's technique worked for me.
    MacPro 1,1, Mac OS X (10.6.4)
  • Mictons Level 1 Level 1 (0 points)
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    Oct 5, 2010 4:50 AM (in response to atmcclain)
    I have been experiencing the same problem, I can unplug the monitor power to get the sound to return but after a day or two I check and it is gone again, I have been fighting this problem for a couple of weeks and am going to make a trip to the Apple Store to see if I can get a permanent fix.
    Macbook Pro, Mac OS X (10.6.4), 500GB HD 8GB MEM
  • pdxgoat Level 1 Level 1 (0 points)
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    Oct 5, 2010 8:32 AM (in response to Mictons)
    Yep, unplugging was only a temporary solution for me also. Seems like we need a software update from Apple.
    MacPro 1,1, Mac OS X (10.6.4)
  • basictheory Level 1 Level 1 (0 points)
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    Oct 5, 2010 8:13 PM (in response to atmcclain)
    I'm having similar problems. Display audio, microphone and iSight camera all have issues. Tried to reset the audio preferences but I'm still having issues days later. Wondering if I should exchange it or wait for a software fix?

    Message was edited by: basictheory
    Mac Pro 3,1 - 2x2.8GHz Xeon, Mac OS X (10.6.4)
  • Daniel Genser Calculating status...
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    Oct 6, 2010 12:22 AM (in response to basictheory)

    +1 on needing a software update. I downloaded the software update released on September 22 (described at http://support.apple.com/kb/DL1107) but I'm not seeing the new "LED Cinema" listing in my sound preference pane as seen below:


    13" MacBook Pro, Mac OS X (10.6.4)
  • melduforx Calculating status...
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    Oct 6, 2010 12:47 PM (in response to atmcclain)
    +1

    I'm having the exact same issues as the OP. I can get it to come back temporarily by using the "down volume" key on the keyboard, but switching around in apps makes the sound drop out.
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