HELP ME! External display problems

Discussion in 'Mac Basics and Help' started by R.Perez, Feb 6, 2011.

  1. R.Perez macrumors 6502


    Feb 16, 2010
    Philadelphia, PA
    Hey guys,

    Hopefully someone here can help me with my weird problem.

    I have my 2010 15" MBP connected to a U3011, via this displayport to mini dp adapter:

    and I am using a cheap mini dp cable along with that adapter. Bought it back when I had an imac so I dont remember where I got it from

    Anyway, for all intensive purpose the screen works fine. It wakes up from sleep just fine, and it is more than usable.

    However I have a weird problem, expose, magnification, mouse over (the arrow turning to a hand) do not work at all. there is also a lag issue, which seems to make it unusable at times.

    I thought it might be an external mouse problem, but when the monitor is disconnected the external mouse works fine, so it must have something to do with the external monitor.

    Any ideas?

    Oh EDIT:

    I also tried this cable

    which did not work at all. The monitor would recognize that something was plugged in and wake up from sleep, but my MBP never detected the display (it would turn blue for a second like it was going to switch over, but then it would just go back to the desktop, and the detect display button found nothing)
  2. Surely Guest


    Oct 27, 2007
    Los Angeles, CA
    I found that I had problems when I used a third party mini-display port to VGA adaptor with my MBP and my external monitor.

    When I returned it and bought the Apple version, my problems went away.

    That is, for all intensive purposes.
  3. rdowns macrumors Penryn


    Jul 11, 2003
    Four all intensive purposes, I've never had any issues with my cables. Then again, I could care less where you get yours from.

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