Mac Pro Dual Monitors problem: intermittent unresponsiveness and shutdown

Discussion in 'Mac Pro' started by Broc27, Sep 28, 2011.

  1. Broc27 macrumors member

    Mar 23, 2010
    Hello there!

    I've been happily using a 2010 Mac Pro since March with a Radeon 5870 card and two Apple displays connected to the card with mini-displayport cables.

    Recently, after I installed Lion, the secondary screen has been acting strangely; sometimes, while I can move my cursor without any problem on it, I can't click on anything. I click and the program, such as Apple Mail or Reason, just doesn't respond in any way. Moving the program window to the main screen solves the problem.

    Moreover the secondary monitor sometimes shuts down for a second, displacing in the meantime all my windows to the main one. It always comes back instantly.

    Finally, when I use Windows 7 the secondary screen isn't even recognized anymore; it stays black and windows doesn't see it.

    I tried of course to unplug and reconnect both monitors a few times but the problem, which in Lion is sporadic, remains.

    Any ideas?
  2. englishman macrumors 6502a


    Nov 6, 2006
    Looks like no-one has a clue - in this situation best call Apple. Or try Apple support forums. Good luck let us know how you get on.
  3. jenzjen macrumors 68000

    Aug 20, 2010
    Switch monitor cables with the working monitor and see what happens. Also, try SMC and PRAM resets.
  4. goMac macrumors 603

    Apr 15, 2004
    Way too many possibilities, could be the card, could be the display, could be the cables...

    As buggy as Lion is, I highly doubt it's Lion. Shortly after sounds like a co-encidence. :)
  5. flatfoot macrumors 65816

    Aug 11, 2009
    +1 on that. It's almost definitely a hardware problem.

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