2013 iMac won't recognize Thunderbolt Display

Discussion in 'iMac' started by technopimp, Nov 18, 2014.

  1. technopimp macrumors 6502a

    Aug 12, 2009
    I have a 2013 27" iMac. I've been trying to plug in my TB display, but it just refuses to "light up". It works 100% of the time connected to either of my other MBP's, but the iMac just won't activate it. I've tried rebooting with it connected, etc. Is there a special "trick" I have to use to get it to come up?
  2. crsh1976 macrumors 6502a

    Jun 13, 2011
    In the Display system preference panel, when you hit Option+click there should be a "Detect Displays" button, it does nothing?

    Otherwise, Apple Support says to disconnect peripherals, zapping the PRAM and reconnect things afterwards to see if it fixes the no signal thing.
  3. jdphoto macrumors 6502


    Jan 13, 2014
    Have you also tried both Thunderbolt ports? Maybe one has gone bad?
  4. technopimp thread starter macrumors 6502a

    Aug 12, 2009
    Correct. I hit it and nothing happens.

    And yes, tried both TB ports. I have other TB peripherals so I know they both work.

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