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External monitor turns off when I close my Macbook

9210 Views 6 Replies Latest reply: Dec 4, 2013 8:34 AM by TheSmokeMonster RSS
BlagovesTaskov Level 1 Level 1 (0 points)
Currently Being Moderated
Jul 28, 2012 11:50 AM

I have Macbook Pro 13 (mid 2009, ver 5.5, 4GB ram, 2.26 x 2 CPU) running Mountain Lion 10.8.0.

 

All I want is having my Asus monitor ON and the LED Macbook display OFF (doesn't matter if the Mac will be closed or opened, all i want is it to be off).

 

I have attached the Macbook to the power cord (and the icon in the upper right is showing, that it is charging).

When I close my Mac, both displays turns off (the Asus monitor is the main one, screen mirroring is off). Then, if I press mouse button (Mighty Mouse) or any of the keys on my wifi (not bluetooth, wifi) keyboard - nothing happens (i checked the option in system preferences, bluetooth input can wake my Mac according to them). The keyboard and the mouse are working fine ...

 

Whole day I am trying whatever I can think of - some Terminal comands (for nvram, reset it, you name it, i tried it) ...

 

Any ideas ... Last I tried this with Snow Leopard and it was working ................................

MacBook Pro, OS X Mountain Lion
  • TheSmokeMonster Level 4 Level 4 (3,240 points)
  • captfred Level 7 Level 7 (26,225 points)

    If you close the lid the system sleeps, if you meet the requirements of clamshell mode then it remain awake.

    My guess is that your wifi keyboard isn't being recognized to meet these requirements.  Try it with a usb or bluetooth keyboard to see if it changes things.

     

    http://support.apple.com/kb/HT3131

  • TheSmokeMonster Level 4 Level 4 (3,240 points)

    That's why we're here!

  • MacMester Level 1 Level 1 (0 points)

    Dear SmokeMonster,

    ups, I posted this text onto another discussion already, sorry, wrong place. (it was with mouse problem). so here it is again: i have the same problem as discussed before - my white macbook is connected to an external display (Samsung LCD), and when I close the lid, I "lose" the big screen as well. maybe it is just some kind of system preference setting - it used to work all right for the past half six months, then since I connected a wireless mouse about two days ago, it is giving me problems. Do you have any good tips? Thanks! MacMester.

  • TheSmokeMonster Level 4 Level 4 (3,240 points)

    Capt. Fred posted a very good support page about how to acheive clamshell mode external displays.

     

    http://support.apple.com/kb/HT3131

     

    Requirements for closed display mode:

    • Power adapter
    • External keyboard, mouse, or trackpad
    • External display

    Use these steps to enable closed clamshell (display closed) mode:If you are using a wired keyboard and mouse:

    1. Make sure the computer is plugged in to an outlet using the AC power adapter.
    2. Connect a USB keyboard and mouse to your computer.
    3. With the computer turned on connect the Mac notebook (using the appropriate Apple adapter if necessary) to the appropriate port on the external display or projector and turn the display or projector on.
    4. After your computer's Desktop appears on the external display, close the computer's lid.
    5. When you close the lid:
      • In OS X Lion and later, 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 Mac notebook as you normally would, with a USB keyboard and mouse.If you are using a Bluetooth keyboard and mouse on a Bluetooth enabled Mac notebook:

    1. Make sure the computer is plugged in to an outlet using the AC power adapter.
    2. Verify that Bluetooth is turned on by using the Bluetooth pane of System Preferences or the Bluetooth menu icon.
    3. Pair your Bluetooth keyboard or mouse with the computer. For step-by-step instructions, see this article forkeyboard pairing or see this article for mouse pairing.
    4. In System Preferences, be sure that the Allow Bluetooth devices to wake this computer option is selected.
    5. With the computer turned on connect the Mac notebook (using the appropriate Apple adapter if necessary) to the appropriate port on the external display or projector and turn the display or projector on.
    6. After your computer's Desktop appears on the external display, close the computer's lid.
    7. When you close the lid:
      • In OS X Lion and later, 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 Mac notebook as you normally would, with a USB keyboard and mouse.

    Note: If your external display is not recognized when it is connected and the computer is powered on, try connecting the display while the computer is asleep or while the computer is off; wake or power on the computer after you connect the display.

    How to disconnect your Mac notebook from the display after use:

     

    For best results it is recommend that you put your computer to sleep before disconnecting your display.

     

    Note: Some DVI and Mini DisplayPort displays—including Apple's aluminum-framed DVI displays and the 24-inch and 27-inch LED Cinema Displays—can be unplugged without putting the computer to sleep. If you aren't sure whether your display supports this feature, put your computer to sleep before unplugging the display.

    Opening the internal display while in closed clamshell mode

    Opening the display on your Mac notebook while it is in closed clamshell mode will have different results based on the operating system you are running.

    OS X Lion and later

    If you open the lid of your supported Mac notebook computer while in closed clamshell mode, the display will flicker to a blue screen after a few moments then both displays will become active. Close the lid to return to closed clamshell mode.

    Mac OS X v10.6.8 and earlier

    If you open the lid of your supported Mac notebook computer while in closed clamshell mode it may appear to have no video. This is expected behavior. When your computer is in closed clamshell mode the built-in display is disabled and all video memory is allocated to the external display for best performance.

    To reactivate your built-in display, sleep the computer and then wake it, or use the Detect Displays button in the Displays preferences. You can also use the key combination Command+F1 on keyboards that do not have a Numlock key.

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