Yosemite broke Target Display Mode on my iMac

Discussion in 'OS X Yosemite (10.10)' started by megalaser, Oct 26, 2014.

  1. megalaser macrumors 6502


    Nov 17, 2009
    Hi, I have a 2011 27 inch iMac that I have been using as a monitor for my Mac Pro via a Thunderbolt cable - the iMac was in Target Display Mode (TDM), I just upgraded the iMac from Mavericks to Yosemite and now it does not go into TDM, if I hit Cmd/F2 as previously the display just breaks up and freezes - does anyone else happen to have this problem please? Thanks!
  2. rainydaze macrumors newbie

    Nov 3, 2014
    Me too...although when I press cmd-F2, nothing happens to the external display, it just keeps ticking along as normal. I've tried both boot orders, unplugging and replugging.

    When I first installed Yosemite, it worked fine, but then when I installed the minor version update, it stopped working :-( Perhaps I can go back to 10.0 somehow...

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