I am using my iMac 2017 5k as my main machine and want to use my 21 inch 2017 iMac in target display mode.

When I try Command + F2 I hear a beep and nothing happens. I have also tried doing it at the login screen and also tried fn + Command + F2 but nothing worked. What am I doing wrong? Is this possible?


Neither of your Macs support target display mode. Below are the Macs that do.

  • iMac (27-inch, Late 2009)
  • iMac (27-inch, Mid 2010)
  • iMac (Mid 2011-Mid 2014)

For more information see Use your iMac as a display with Target Display Mode.

  • What is a good workaround david? – blackace Jan 24 '18 at 9:46
  • 1
    I do not know of any good workarounds. – David Anderson Jan 24 '18 at 10:09

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