Mac Pro (2008) won't boot consistently. Getting repeating startup chime.

Discussion in 'Mac Pro' started by iamkarlp, Jul 16, 2013.

  1. iamkarlp macrumors regular

    Oct 15, 2008
    I have a Mac Pro which seems to have become sick. It normally won't boot, and when it does it will lock up after an hour or two and then proceed not to boot for awhile.

    It doesn't seem to be a heat issue.

    The machine boots up, gives a startup chime, then waits 3 seconds, and chimes again. It does this repeatedly - chime - 3 seconds - chime - 3 seconds - etc, until you hold the power button to kill it.

    Any insight appreciated.

    Karl P
  2. 666sheep macrumors 68040


    Dec 7, 2009
    There is only 2 potential reasons:
    – bad PCIe card (most likely graphics card)
    – bad logic board
    Remove graphics card and try to boot. If you have any other PCIe cards, remove one by one and test.
  3. OS6-OSX macrumors 6502a


    Jun 13, 2004
    Also search 1. Zapping the Pram 2. Resetting the SMC
  4. iamkarlp thread starter macrumors regular

    Oct 15, 2008
    GFX looks spot on.

    I didn't have another Mountain Lion compatible video card laying around, so I threw in a low-end (windows) workstation Nvidia card figuring that it would at least make the noises stop if that was the problem.

    Imaging my surprise when it cleanly booted right up.

    I have rebooted it a few times and all seems well.

    A new ATI will be inbound shortly.

    Karl P
  5. dunderheid macrumors newbie

    May 19, 2012
    Och Aye The Noo
    Boot loop workaround

    If it's any help, my 2010 Mac Pro has booting issues and goes into a "boot loop" if my monitors are switched on when I boot. My workaround for this is to boot the Mac and then power up my screens. So I guess that points to a PCI Graphics card problem, which I haven't investigated any further as I have a working solution.

    Mac Pro 3.33 6-core, ATI Radeon HD 5870, 2 x Hanns-G 27" monitors

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