Second display cannot be detected

Discussion in 'Mac Basics and Help' started by Graemephil, Apr 11, 2010.

  1. Graemephil macrumors newbie

    Apr 11, 2010
    I recently purchased an LG Flatron monitor to use as my second display for my MacBook Pro (unibody). I had it working with great results for about a week, but today when i plugged it in, the monitor is not detected. I have been looking through other's problems trying many of the same things, to no avail. Any other advice would be very much appreciated.

    This was the only other one i saw that was a problem similar to mine, though time seemed to have solved the problem:
  2. Repo macrumors 6502a


    Feb 11, 2009
    Troubleshooting tips:
    1) Make sure the external monitor is set on the correct input
    2) Restart Macbook with and without external monitor connected
    3) Turn external monitor on/off while connected
  3. Graemephil thread starter macrumors newbie

    Apr 11, 2010
    Tried all of these several times, but nothing. All of the cords i'm using have been used for less than a week. When i plug in and unplug the MiniDisplay my Pro's screen will go blue for about a second, so it's sensing some sort of change.

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