SOLVED - GTX 6XX hanging on startup with more than 2 displays, please help!

Discussion in 'Mac Pro' started by All Taken, Jan 3, 2013.

  1. All Taken, Jan 3, 2013
    Last edited: Jan 4, 2013

    macrumors 6502a

    Joined:
    Dec 28, 2009
    Location:
    UK
    #1
    I've got my GTX 680 working with my two monitors over vga and dvi, when I plug in my TV via HDMI it's fine if the machine is booted and running but if I restart/shutdown the next time it starts it completely hangs in a grey screen. It won't boot properly until I remove the HDMI screen. How on earth do I fix this? Thanks
     
  2. macrumors regular

    Joined:
    Dec 14, 2012
    Location:
    Arizona
    #2
    Are you looking for an explanation or a solution?

    I have no solution as one does not likely exist.

    As for an explanation the GTX 680 is not officially supported for the Mac Pro. The card you have does not have Mac-compatible firmware and so will exhibit strange behavior upon boot as the Mac's firmware attempts to activate and enable all the video card's features. When it encounters features of the card it can't handle it will halt the boot process to prevent damage to the machine. A different set of drivers are used after boot which is likely why you can use the HDMI port after boot but not during.

    In short you will have to tolerate strange behavior if you want to continue using that card with your Mac Pro.
     
  3. thread starter macrumors 6502a

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    #3
    But do you actually have any idea what is causing this? Do you run a GTX 6XX series card?
     
  4. macrumors 6502

    El Awesome

    Joined:
    Jul 21, 2012
    Location:
    Zurich
    #4
    Did you install the Nvidia driver or are u running the native one?
    Try to (un)install it and check if it gets better.
    Or try to boot in safe mode (hold shift while booting)
     
  5. thread starter macrumors 6502a

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    #5
    Still no joy, I'm running the latest Nvidia driver. Do you have any issues with your PCI fan ramping up?
     
  6. macrumors 6502

    El Awesome

    Joined:
    Jul 21, 2012
    Location:
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    #6
    A bit yes, something of 1200rpm, but not more.
    Try to uninstall the driver and run the native one. They still support Kepler cards.
     
  7. macrumors 6502a

    Joined:
    Mar 30, 2012
    #7
    Are you using that third-party HDMI audio driver? Perhaps try removing that to see if it's the root cause? I'm only using a single monitor with my GTX 680 and haven't seen any issues like this at all.
     
  8. thread starter macrumors 6502a

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    #8
    I am and I'm not. I tried it with both but no difference. I can plug in my third monitor when the system is booted and idle but booting with the third plugged in is a no go. This issue is plastered on the hackintosh side but not so much on the Mac Pro side as it's not a native card and few people are using a genuine mac pro with a gtx 680 let alone that and triple monitors. Is this a driver issue or a simple fix that i'm missing? :confused:
     
  9. macrumors 6502a

    Joined:
    Mar 30, 2012
    #9
    Huh, I thought I'd seen confirmation that it was working fine. I'll try and dig up an extra couple of monitors and test it myself this weekend, I'm only using a single display with my GTX 680 and it's been rock solid for me so far.
     
  10. macrumors regular

    Joined:
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    #10
    What's causing it is that the GTX 680 does not have Mac firmware. It is not a Mac video card. It works once the system is booted because the nVidia OS drivers are present but without the appropriate firmware it will not work correctly upon boot.
     
  11. thread starter macrumors 6502a

    Joined:
    Dec 28, 2009
    Location:
    UK
    #11
    So only cards with EFI can run more than 2 monitors in a Mac Pro?

    ----------

    Much appreciated, my 680 is solid otherwise but only having access to 2 outputs blows.
     
  12. macrumors 6502a

    Joined:
    Mar 30, 2012
    #12
    What do you mean by "it" when you say it won't work correctly? AFAIK there have been people who got 3+ monitors working just fine with a Kepler GPU running Mountain Lion and the latest NVIDIA driver (note that the NVIDIA driver is currently required as I understand it, the stock Apple driver does not support 3+ monitors).
     
  13. All Taken, Jan 4, 2013
    Last edited: Jan 4, 2013

    thread starter macrumors 6502a

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    #13
    SOLVED

    Turns out since I was running one DVI and one HDMI the second DVI slot couldn't be DVI-VGA. I purchased a straight through DVI dual link cable and presto 3 monitors. Windows was fine with the DVI to VGA on one DVI port and one DVI to HDMI on the second DVI but OS X was not, it's a driver issue in OS X that hopefully 10.8.3 has fixed.

    To anyone reading this and wondering if it is fixable, good news it is as simple as ensuring the two monitors on the DVI ports are DVI-D cables, you can use DVI-D to HDMI or whatever you like but it has to be DVI-D.

    The mistake I made was running one DVI port at DVI-D and one at DVI-I.

    Two DVI-D is required if using both the DVI ports in OS X, at least with the latest drivers available in OS X and from Nvidia.

    Really simple mistake to make and hopefully this helps someone. Thank you for everyones input.

    [​IMG]
     
  14. macrumors regular

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    #14
    I'm glad you got it resolved! Just be mindful that you may still encounter issues. That being said, I find it encouraging that your Mac pro works with that card. If I may ask, which Mac Pro are you running?
     
  15. thread starter macrumors 6502a

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    #15
    It's a 5,1 2012.
     
  16. macrumors 6502

    JavaTheHut

    Joined:
    Aug 15, 2010
    #16
    Good to know tx
     
  17. jaxhunter, Jan 10, 2013
    Last edited: Jan 10, 2013

    macrumors regular

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    #17
     

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