Monitor not recognized over long VGA run.

Discussion in 'Mac Pro' started by mattod, Oct 4, 2012.

  1. mattod macrumors newbie

    Oct 4, 2012
    here's a long one I need help on.
    Have a Mac Pro tower with a NVideo GeForce 8800 running long VGA cables to a pair of DELL 23" displays. On the back of the tower we've got DVI to VGA adapters. One side works fine. Computer recognizes the monitor just fine. Other side won't recognize and won't support full resolution. My fix has been walk the monitor to the computer. Plug in via a shorter vga cable (still using adapter). The tower recognizes the monitor. Then I can unplug and connect back up via longer VGA run. Problem is anytime I reboot I have to do the same damn process all over gain. :mad:
    So... I'm wondering. Is there anyway to force the comp to just always think what it is hooked up to is this specific monitor (DELL U2312HM) and to stop trying to figure it out on it's own?
  2. SilentPanda Moderator emeritus


    Oct 8, 2002
    The Bamboo Forest
    VGA has a maximum distance depending on the resolution. For a permanent fix you can buy a signal booster.
  3. hfg macrumors 68040


    Dec 1, 2006
    Cedar Rapids, IA. USA
    Buying some better cables might work as well if it is simple noise issues from cable reflections or poor shielding.

    Check out for good cables at reasonable prices.

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