Mac Pro, volume stuck on mute.

Discussion in 'Mac Pro' started by Runamuk, Jul 30, 2010.

  1. macrumors newbie

    Joined:
    Jul 6, 2010
    #1
    I have a late 2006 Mac Pro 3Ghz dual. Recently the volume dropped down to nothing and when I access the control panel, I see the mute button checked on all outputs except the digital (the one I have never used). All inputs are also muted and I cannot uncheck any of them. The little volume indicator is sitting in the lower middle of my screen and won't go away.

    I have tried:
    Zapping PRAM
    repairing permissions
    trashing the sound pref
    using a different account
    multiple restarts and shut downs
    unplugged and re-plugged both the headphones and line out

    ....and none of it has worked. The sound indicator shows up with the startup screen and never goes away...and I have no sound. If I drag the volume slider up, it just goes back down. Very frustrating.

    I am guessing this is a failing motherboard, being that I have lost my "A" RAM slot, but I really hope not. This is going to be unbearable to live with.

    Does anyone here have any other ideas? I have thrown in the towel (which I rarely do).

    Thanks!

    hey, at least the comp cannot hear the profanities directed it's way.
     
  2. macrumors regular

    Joined:
    Oct 5, 2006
    #2
    Don't know how to fix it, but it would be cheaper to add a PCI sound card than a new motherboard.
     
  3. macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
  4. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #4

    Ok, I could live with that, but does a PCI sound card preempt all the onboard sound stuff automatically? Would it put this problem in the background or is there a chance this deeper in the system than that?
     
  5. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #5
  6. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #6
    Ohhh, and nothing is resting on the keyboard buttons. I have even unplugged the keyboard and had no change in condition.
     
  7. macrumors member

    Joined:
    Oct 19, 2008
    #7
    If you go to audio MIDI utility can you change the output to the analogue out?
     
  8. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #8
    Changing the output is not the problem, I can do that in the sys prefs. The problem is that no matter what output I choose ... it is muted.

    Honestly, I could live without having sound as it appears this Mac is dying a slow death. It's the sound indicator on the screen that drives me bonkers.
     
  9. macrumors regular

    SmilesLots

    Joined:
    Apr 30, 2010
    Location:
    SW Virginia
    #9
    Run the combo updater for your OS. Often solves this kind of problem, which could be a bad sector on the HD.
     
  10. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #10
    OK, so yesterday, just out of the blue while I was typing an email, the sound started working again. The screen indicator disappeared and I could raise the volume again....woot!

    So, I followed your advice and installed the combo updater, the sound stayed working. Thought I had it nailed.

    Then, this morning, I woke it from sleep and 30 seconds later, the sound dropped out and the issue returned. So, back to square one, no clue what caused it to self-fix and no clue why it relapsed.

    grrrrrrrrr
     
  11. macrumors 6502a

    Joined:
    Oct 2, 2007
  12. thread starter macrumors newbie

    Joined:
    Jul 6, 2010
    #12
    That's what I was afraid of. Are you thinking motherboard or drive? and is there any way to test?
     
  13. macrumors 6502a

    Joined:
    Oct 2, 2007
    #13
    motherboard, install windows on it with bootcamp and checl sound there (when it doesnt work in osx)
     

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