No audio on Mac Pro (10.11.6)

Discussion in 'Mac Pro' started by lsara3699, Jul 11, 2017.

  1. lsara3699 macrumors newbie

    Jul 11, 2017
    Hi all, I just bought a used Mac Pro running a fresh install of El Capitan 10.11.6 and have found that I can't get any audio to be produced. I have options for Internal Speakers, Line Out, and Digital Out in Audio Preferences. None of them work, including Line Out with headphones plugged in either the front or back jacks. I tried killing the coreaudio process, then restarting, but that hasn't helped. I see it using CPU when there should be audio playing. I don't have startup chimes either, so I can't tell if my PRAM restarts are doing anything. Any ideas? Thanks so much.
  2. fastlanephil macrumors 65816


    Nov 17, 2007
    Maybe there is something here.
  3. h9826790 macrumors G4


    Apr 3, 2014
    Hong Kong
    You don't need the chimes to confirm if PRAM reset is working.

    If it works (but speaker disabled), you will see the grey screen for few seconds, and then go black again. If you keep pressing Command + Option + P + R. This grey -> black cycle will keep repeating (around every 10 seconds, depends on your hardware config, may take a bit longer).

    If PRAM reset work, but still no chime from the internal speak, that's something wrong.
  4. thornslack macrumors 6502

    Nov 16, 2013
    It sounds like you may have done this already, but plug some headphones into the front jack and see if that changes anything.
  5. orph macrumors 68000


    Dec 12, 2005

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