External monitor not working when no AC plug?

Discussion in 'MacBook Pro' started by l3lack J4ck, Apr 8, 2007.

  1. l3lack J4ck macrumors member

    Joined:
    Nov 23, 2006
    #1
    why is that when i unplug my power cord from my macbook pro (which i have a 22" widescreen display hooked to it) the external monitor turns off? It goes into no signal, even though i have 100% battery left? I usually have my macbook plugged in and this is kind of an annoyance when it accidentally comes unplugged.

    Any way to keep the external on when mbp is not plugged in?


    thanks
     
  2. j26 macrumors 65832

    j26

    Joined:
    Mar 30, 2005
    Location:
    Paddyland
    #2
    Try Detect Displays in System Preferences and see if it spots the external monitor.
     
  3. plinden macrumors 68040

    plinden

    Joined:
    Apr 8, 2004
    #3
    No, that's just the way it works. You need to be plugged in to work with an external monitor.
     
  4. orangemacapple macrumors 6502

    Joined:
    Sep 1, 2006
    Location:
    Raleigh
    #4
    it'll work if you have the lid open.

    open the lid and then unplug the ac. everything stays the same.

    strange, i know.
     

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