2018 MacBook Pro connecting to late 2009 27" iMac Target Display Mode: Command+F2 does nothing

Discussion in 'iMac' started by abp1, May 8, 2019.

  1. abp1 macrumors newbie

    May 8, 2019
    I'm using an Apple USB-C to Thunderbolt 2 adapter on the 2018 MacBook Pro and a Mini DisplayPort cable (not a Thunderbolt cable) to the iMac. It doesn't work. The Mini DisplayPort cable and Target Display Mode works great with a mid-2014 MacBook Pro (with Thunderbolt 2 ports).

    Would a Thunderbolt cable work?

    Has anyone successfully used a 2018 MacBook Pro in Target Display Mode to a late 2019 27" iMac?

    If that combination doesn't work with Target Display Mode, is there other software or hardware to display the 2018 MacBook Pro screen on a late 2009 27" iMac?

    Thanks in advance.
  2. chabig, May 9, 2019
    Last edited: May 9, 2019

    chabig macrumors 603

    Sep 6, 2002
    The USB-C to Thunderbolt 2 adapter does not support DisplayPort: https://www.apple.com/shop/product/MMEL2AM/A/thunderbolt-3-usb-c-to-thunderbolt-2-adapter

    "This adapter does not support DisplayPort displays like the Apple LED Cinema Display or third-party DisplayPort and Mini DisplayPort displays."

    Also: https://support.apple.com/en-us/HT207266

    And your 2009 iMac doesn't support target display mode using Thunderbolt: https://support.apple.com/en-us/HT204592

    This means that you will need a USB-C to MiniDisplayPort adapter of some sort. I see several on Amazon for around $20. I searched for "USB-C to minidisplayport".

    Here is a simple adapter: https://www.amazon.com/DisplayPort-...i+displayport&qid=1557387804&s=gateway&sr=8-3

    Here is direct connect cable: https://www.amazon.com/Cable-Matter...i+displayport&qid=1557387804&s=gateway&sr=8-4
  3. abp1 thread starter macrumors newbie

    May 8, 2019
    Thank you chabig. I appreciate your reply, especially your suggestion about trying a USB-C to Mini DisplayPort adapter, and providing a couple choices.
  4. abp1 thread starter macrumors newbie

    May 8, 2019
    Thanks EugW. I think I see a solution ahead! The key seems to be a USB-C to Mini DisplayPort (not Thunderbolt) adapter or cable. I'll be testing out a friend's adapter next week. Nothing like being hopeful again.
  5. EugW macrumors 603


    Jun 18, 2017
    Doesn't have to be a USB-C to mini-DisplayPort adapter. Can be a USB-C to regular DisplayPort adapter.

    In my case it's a USB-C to regular DisplayPort adapter, then I use a DisplayPort to mini-DisplayPort cable.

    Why did I do it this way? Only cuz it turned out at the time to be a bit cheaper and easier/quicker to get the stuff.

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