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Secondary Monitor Connecting Issues

Attempting to use my older 2011 iMac running High Sierra as a secondary monitor to my newer 2013 iMac. Connected with Mini Display connected in the Thunderbolt ports and not working. The Command-F2 or Command-Fn-F2 key strokes don't do the trick. HELP!

MacBook Air 13″, macOS 10.12

Posted on Jun 23, 2020 6:22 PM

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5 replies

Jun 23, 2020 7:17 PM in response to rlogan

Oh wait,,. you said Mini Display! Wrong cable. :)


Target display mode requires macOS High Sierra or earlier on the iMac used as the external display. It does not work with macOS Mojave or later.

Secondary Monitor Connecting Issues

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