I try to use my iMac as a external screen or otherwise if possible, but when I press ⌘ CommandF2 nothing happened. I also try fn⌘ CommandF2 just to be sure

MacBook Pro 2012 iMac 27" 2012

Using Thunderbolt 2

  • Have you had a good look at Use your iMac as a display with Target Display Mode? – Monomeeth Feb 11 '17 at 11:09
  • @Monomeeth yes, but I have done this before, but now I can't. that why I ask – TheCrazyProfessor Feb 11 '17 at 11:10
  • How long has it been since this worked for you? And are you already logged into the MacBook Pro before trying to press Command-F2? – Monomeeth Feb 11 '17 at 11:13
  • @Monomeeth I think is was in Yosemite. And yes I am logged in before press cmd + F2 – TheCrazyProfessor Feb 11 '17 at 11:15
  • Both the MBP 2012 and iMac 2012 have Thunderbolt 1 ports. A TB2 cable should work, but I would take a look at that as well just to be sure. – Allan Feb 11 '17 at 12:28

Well, i found out why... I just needed to turn the cable around. For some reason, the Thunderbolt cable can be plugged in the wrong way.

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