Help with 3,1 MP

Discussion in 'Mac Pro' started by tatt2ed, May 15, 2015.

  1. tatt2ed macrumors newbie

    May 17, 2012
    I got a MP 3,1 with a Nvidia 8800gt (Mac not PC) but the previous owner wiped the drive so it is back to OSX 10.5 (I believe so anyway).

    I am not getting a signal to the monitor and have tried a few monitors.
    The fan runs full speed on the video card.

    I might be mistaken but if it was set back to 10.5 the video card wouldn't be supported?
    I do hear the chime and then the VoiceOver, which I believe is part of the install?

    BTW, I am a Mac novice, if you didn't already guess.

  2. bax2003 macrumors 6502a


    Dec 25, 2011
    Graphics drivers for 8800GT are included in Leopard 10.5.2 or greater.

    - Did you try both DVI outputs ?
    - Is card connected with Mac Pro logicboard with black 6-pin power cable ?
  3. tatt2ed, May 15, 2015
    Last edited: May 15, 2015

    tatt2ed thread starter macrumors newbie

    May 17, 2012
    Yes to both questions. I am a novice at Mac, but over 20 years in IT, and started in hardware with PC's.
    Did hours of research, but still not sure, but it may be a bad card.
    I swapped cables, tried straight DVI and Analog to DVI (it had the Apple adapter when I got it) monitors, the second PCIe 16x slot.

    From my research it seems these 8800gt cards aren't very reliable.
    I don't really want to replace it since the technology is so old and even on eBay the prices seem way inflated. If the card isn't the problem, out about $100 or more. A PC version is only about 1/3 that, so I might try it.
    I did find a sight with the PC versions that work and can be flashed. They have the links for the EFI flash and instructions.

    Any other suggestions or do you think I have narrowed it down to a failed card?
    I don't have the original OSX. I believe the last iMac I had, had a small installer, then downloaded the os. No cd or dvd. Would that be the same for the Mp?
  4. IowaLynn macrumors 65816


    Feb 22, 2015
    You can buy 10.6.3 DVD from Apple for $20
    8800GT - lots of failures, one 'fix' and really true - is to bake the card in an oven but a 3,1 can take a lot better newer cards, but only once you have 10.6.8 AND updated to 10.8.3 or above. Apple is only supporting Mavericks and above now.
  5. tatt2ed thread starter macrumors newbie

    May 17, 2012
    I cleaned it and baked it, still the same results.

    Which card would you suggest for $125-150. I am only going to use it as a VM box for app testing

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