Retina MBP using iMac as External Display not working

Discussion in 'Mac Basics and Help' started by mackry, Jun 29, 2012.

  1. mackry macrumors member

    Oct 3, 2007
    I have my Retina MBP connected via Thunderbolt cable from Apple to a 2011 iMac with Thunderbolt ports. Both machines are on. When I press CMD + F2 on the iMac to change the Target Display Mode, nothing works. I've tried restarting both machines, doing a SMC reset – still nothing.

    Any ideas? Thanks!
  2. JediMeister macrumors 68040

    Oct 9, 2008
    Did you install all of the available software updates for the rMBP before trying to use Target Display Mode? See this.

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