iMac 27" Target Display Mode Connection Question

Discussion in 'iMac' started by brucem91, Dec 27, 2010.

  1. brucem91 macrumors 6502

    Joined:
    Dec 9, 2009
    #1
    Hello. I am thinking about using my iMac as an external display for my Dell Laptop listed in my sig. Most of the time at home I can work on my iMac, but occasionally I use windows, and I have the dell for that. According to Apple:

    "On the 27-inch iMac, the same port offers input, too. So you can connect any external source that has DisplayPort output — including a MacBook or MacBook Pro — and use your iMac as a display."

    Does this mean that I should be able to run a DisplayPort to Mini-DisplayPort cable from my Dell to my Mac and use it as an external monitor? I was thinking of picking up one of these cables if it will work:

    http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10246&cs_id=1024606

    Thanks

    BruceM
     
  2. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #2
    If your Dell has (Mini) DisplayPort, then all you need is the cable and it should work.
     
  3. brucem91 thread starter macrumors 6502

    Joined:
    Dec 9, 2009
    #3
    Yea, that's what I thought. It's a DisplayPort, not a mini. Since this type of connection is new to me, I just wanted to make sure before I purchase the cable.

    Thanks
     
  4. TSE macrumors 68030

    Joined:
    Jun 25, 2007
    Location:
    St. Paul, Minnesota
    #4
    I hate to hijack this thread but it relates to this:

    -If the laptop doesn't have a displayport, but something like VGA or HDMI, is this still possible?
     
  5. brucem91 thread starter macrumors 6502

    Joined:
    Dec 9, 2009
    #5
    I tried it via a vga to mini-displayport connection, and it didn't work. Surprisingly though, when I made the connection, my iMac detected that my Dell was an external monitor. I wonder if I could use my Dell Laptop as an external for my iMac.
     
  6. brucem91, Dec 27, 2010
    Last edited: Dec 27, 2010

    brucem91 thread starter macrumors 6502

    Joined:
    Dec 9, 2009
    #6
    now unable to connect iMac to external display

    Hello, here is an update. After attempting to try vga to mdp for target display mode, my iMac can no longer connect to my external display. My Dell can connect just fine via vga, and my MacBook can connect via the same cable that runs normally from my mac. Anyone know why?

    EDIT: Never mind, I got it working. Simple SMC reset worked.
     
  7. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #7
    http://www.atlona.com/Converters-with-DisplayPort-and-Mini-DisplayPort-output/

    Quite expensive but it's possible

    That cable only works one way, i.e. from mDP to VGA, not vice versa like you tried.
     
  8. alvize macrumors newbie

    Joined:
    Feb 22, 2011
    #8
    Hello Brucem91, i'd like to to use my imac 27" as external monitor for my Dell Precision m6400 ( laptop ). since you found out how to do it, could you please tell me exactly what kind of adapter and cables i need?
    I've got the mdp to vga adapter bought from apple store, i've got a vga cable, and i've got a displayport to vga adapter to plug into dell Display port adapter.
    With this configuration it doesn't work ( the imac doesn't recognize the input video signal from dell laptop ) .

    Are you able to help me please?
    Regards.

    alvise
     
  9. alvize macrumors newbie

    Joined:
    Feb 22, 2011
  10. Flyer53 macrumors newbie

    Joined:
    Feb 28, 2011
    #10
    Just purchased a Belkin AV360 MiniDisplay Port from the Apple store so I can use the 27 Imac as an external screen from my Gateway windows machine(long story why). Anyways everything went well but the resolution/blurriness is terrible on the windows side. I noticed some posts here in regard to the Atlona AT HD620..would that work better a far as a clearer screen?

    Thanks
     
  11. alvize macrumors newbie

    Joined:
    Feb 22, 2011
    #11
    Hello Flyer53
    what which video output are you using of the gateway laptop?
     
  12. Flyer53 macrumors newbie

    Joined:
    Feb 28, 2011
    #12
    Alvize,
    It's a new Gateway desktop running windows 7..it has both a VGA & HDMI out for video source. Just trying to utilize this 27" monitor. Was running pararrels, XP and QB for windows on it..and just to many issues and the hard drive seized up on the mac...Just not a machine thats capable of running both operating systems..even though many are.
    Thanks for any thoughts on using it as a monitor for the Gateway.
     
  13. brucem91 thread starter macrumors 6502

    Joined:
    Dec 9, 2009
    #13
    A VGA adapter will not work between your m6400 and your iMac. I've tried. You will need one of the cables listed on the link below:

    http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10246&cs_id=1024606

    All are the same cable, but are just different lengths. If I remember correctly, the M6400 has a diplayport on the side as well, so it should work just fine. What is great is that once the cable is detected, the iMac will automatically switch to display the dell (at least it does for me). You may run into a problem where your iMac screen displays at 800x600, if so let me know.
     

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