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I currently have a iMac (27-inch, Late 2009, Intel Core 2 Duo) which I would like to use as display for a new Mac Pro. How do I do that?

marked as duplicate by nohillside Apr 20 '14 at 8:14

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http://support.apple.com/kb/HT3924?viewlocale=en_US&locale=en_US#4

  1. Connect the Mac Pro to the iMac with a Thunderbolt or Mini DisplayPort cable.
  2. Press Command-F2 on the iMac's keyboard (or Command-Fn-F2 if this doesn't work).

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