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Forums Apple OS X new install of Lion – OS thinks a 3rd monitor is attached for a few seconds after startup then goes away

  • new install of Lion – OS thinks a 3rd monitor is attached for a few seconds after startup then goes away

     Jason Brown updated 8 years, 3 months ago 1 Member · 1 Post
  • Jason Brown

    June 4, 2012 at 1:48 am

    I couldn’t think of a better title, that’s basically it.

    I boot up, OS starts up I log in. If I immediately go to sys prefs > Displays … I can see a smaller 3rd monitor in “arrangement” … after a few seconds…both screens turn blue (as it does when it’s changing monitor layout. Then comes back only showing the 2 correct monitors. Does it every time. Nothing else is attached. It’s an older 2008 MacPro with a KONA LHe card.

    -Jason

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