Mac Pro NVidia DVI output fails, VGA works

Discussion in 'Mac Pro' started by chris777, Sep 17, 2008.

  1. chris777 macrumors newbie

    Sep 17, 2008

    I just got a new Mac Pro 2x Xeon, with NVidia graphics (512 MB RAM). After trying 2 different displays and different connection variants I finally found one working setup.

    Only with a monitor connected via VGA cable to the second output, I get working display output during boot process and thereafter. Once that was working, I could connect a second display (Eizo 24", 1920x1200) via DVI to the first graphics output and got it working. It is enabled not during boot (no gray background and no apple image), it is enabled as the login screen appears. The VGA connected display uses the default 1024x768 instead of available 1600x1200. Higher resolution settings are not available from the control panel.

    So my question is, is there a known problem with different kind of DVI cables or displays (DVI 'dual link'?) and the new NVidia graphic cards inside the current Mac Pro? May this be some kind of strange hardware failure? I think this is the most likely cause. Both displays and monitor cables do work fine with PC and an older Mac Mini (single core intel). As the system got delivered yesterday, I wonder whether I should ask for a exchange graphics card or if I should send back the whole system.

    Thanks for your help or comments,

  2. Mackilroy macrumors 68040


    Jun 29, 2006
    Sounds like something is wrong with your card - I have two 20" displays hooked up via DVI to my 8800 GT and they both work perfectly.
  3. chris777 thread starter macrumors newbie

    Sep 17, 2008
    Got it working :-D

    I got the display output working correctly by reseting the "PRAM" during boot :cool:

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