Can't keep external monitor video feed on after Macbook lid is closed

Discussion in 'MacBook' started by brasskey, Feb 12, 2012.

  1. brasskey macrumors regular

    Joined:
    Jul 21, 2008
    #1
    I'm not sure what I'm doing wrong, but I just can't figure out how to keep the computer from going into sleep mode when I have an external monitor connected and the lid on the Macbook is closed.

    The specs on my Macbook are as follows:
    Late 2008 13" Aluminum Macbook
    2.4 Ghz Intel Core 2 Duo
    4 GB RAM
    NVIDIA GeForce 9400M 256 MB
    OS X Lion 10.7.3

    I am connecting to an older Westinghouse LCD TV with no problems. I am going from the Macbook Mini DisplayPort to the TV with a Monoprice Mini DisplayPort --> DVI adapter. The picture comes across great on the TV but will not stay on once the Macbook is closed. I did some research and found that the external display should automatically stay on with OS X Lion. That's not the case for me. I also read that if a key is pressed on an external keyboard once the lid is closed, this will wake the external monitor. I connected an external keyboard and tried pressing a key, but that also didn't work for me. Lastly, I tried InsomniacX, but it didn't work either.

    Any ideas on what I could be doing wrong? Thanks.
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
  3. brasskey thread starter macrumors regular

    Joined:
    Jul 21, 2008
    #4

    I'll look into those others. Thanks.



    I've already been to that site. I tried what it suggested before my initial post,

    "When you close the lid:
    In OS X Lion, the external display will change to a blue screen, then will show your desktop.
    In Mac OS X v10.6.8 and earlier, wake the computer up by clicking the mouse button or by pressing a key on your external keyboard.
    You should now be able to use your Apple portable as you normally would, with a USB keyboard and mouse."

    Neither (automatically recognized by Lion or pressing a key on an external wired keyboard) worked for me.
     
  4. Peace macrumors P6

    Peace

    Joined:
    Apr 1, 2005
    Location:
    Space--The ONLY Frontier
    #5
    Do you have a different brand mini-display port to DVI cable ? Maybe that's the problem. I've heard about some Monoprice cables being kinda funky.

    Also. does the TV have HDMI ? If so try a mini-displayport to HDMI cable.
     
  5. brasskey thread starter macrumors regular

    Joined:
    Jul 21, 2008
    #6
    I don't. I have a Mini DisplayPort --> VGA though. I'll try that.


    No it doesn't. But, I tried a Mini DisplayPort --> HDMI cable on my living room TV and the same thing happened (couldn't keep external monitor on after closing Macbook).

    All cables I have are Monoprice. I guess that could be the problem, but it's weird that all three would be bad.
     

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