My macbook need restart to detect external monitors, any hint?

Discussion in 'MacBook Pro' started by sarah.kho, Aug 12, 2011.

  1. sarah.kho macrumors member

    Sep 22, 2010

    I have a macbook pro 2010, core i5. I tried it with two external monitors and in both cases it does not detect the monitor unless I restart the laptop with the external monitor cable attached.

    - I tested it with the mini displayport to VGA for the projector
    - I tested it with mini displayport to displayport and the Dell U3011 LCD.

    After the restart, it works fine and both monitors are detected but if I disconnect the LCD from laptop and plug it again, it wont work until I restart it.

    I had mac os 10.6.x and now I upgraded to 10.7 and still the same issue.

    Any comment or help is welcome.

  2. jbg232 macrumors 65816


    Oct 15, 2007
    Are you starting the computer with the laptop in clamshell mode? That normally doesn't work very well from my experience.
  3. maril1111 macrumors 68000


    Mar 14, 2010
    I have the same issue 2/3 times however I use my laptop in clamshell mode, if i leave it open and do the disconnect,and replugging it works.

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