I mistook the mini Display Port (mDP) behind my iMac to mean it was a Thunderbolt port. The ⌘ Command F2 does not work when both ends are Thunderbolt for my setup.

Please suggest what cables to buy.

Edit: This is 27 inch iMac Model Identifier: iMac11,3

  • Which iMac do you have specifically? Please issue the command system_profiler SPHardwareDataType | grep -i identifier in Terminal and post the results to your original question. – Allan Jun 22 '16 at 17:26
  • Added Model Identifier: iMac11,3 – Blanche Ebbutt Jun 22 '16 at 18:14
  • Thanks. That info is super important to make sure we are giving you an accurate answer. – Allan Jun 22 '16 at 18:18

If you are using a 27 inch iMac (Mid 2010) then you need a mini DisplayPort to mini DisplayPort cable.

According to Apple's Support Page, Use your iMac as a display with Target Display Mode, you can accomplish this with the cable referenced above, but only with a 27" iMac if you are using the Mid 2010 model.

system requirements

  • Do I need an mDP to ThunderBolt cable too - my MBP does not have a mDP port. It has two Thunderbolt ports instead. – Blanche Ebbutt Jun 22 '16 at 17:55
  • No. mDP to mDP per Apple. A Thunderbolt port is a combination of mDP and PCIe. – Allan Jun 22 '16 at 18:08
  • So one end of the new mDP cable will connect to the iMac and the other end will also fit into the Thunderbolt port on my MBP? – Blanche Ebbutt Jun 22 '16 at 18:14
  • Correct. mDP and TB use the same connector. I wrote a primer on TB here. – Allan Jun 22 '16 at 18:17

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