1 Reply Latest reply: Dec 20, 2012 6:21 PM by BDAqua
multlock Level 1 Level 1 (0 points)

Hi I was told I could use my IMAC 27" late 2009 as a external monitor for my Mac Book Pro I just got.  I bought a thunderbolt cable but it doesnt work.  Is there a command I need to use on the imac to act as a external monitor ?


iMac, Mac OS X (10.7.4)
  • BDAqua Level 10 Level 10 (119,045 points)

    Hi, not sure a TB cable works or not...

    To use an iMac (27-inch, Mid 2010) or iMac (27-inch, Late 2009) in Target Display mode with another computer as the source:

    1. Make sure both computers are turned on and awake. 
    2. Connect a male-to-male Mini DisplayPort cable to the Mini DisplayPort on each computer. The 27-inch iMac will enter Target Display mode and display content from the source computer.
      Note: If you are connecting two 27-inch iMacs, connect a Mini DisplayPort cable to each computer and press Command + F2 on the 27-inch iMac keyboard that you will use as an external display.
    3. To leave Target Display mode, press Command + F2 on the keyboard of the 27-inch iMac that is in Target Display mode. To return to Target Display mode, press Command + F2 again.

    http://support.apple.com/kb/HT3924