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young188 Author

Level 1

4 points

Target display not working

I am trying to connect iMac (21.5 inch, 2019; Big Sur 11.2.2) to iMac (21.5 inch, late 2015; El Capitan 10.11.6) to use the latter as a second monitor. I am using Thunderbolt cable and tried Target Display Mode (command +F2), but nothing is happening. I also bought a new thunderbolt cable and tried, but again it did not work. I previously set up Target Display Mode on multiple iMacs before, and troubleshooting tips (restarting the computers) usually solved any issues, but no this time. Any one please help!

iMac Line (2012 and Later)

Posted on Mar 15, 2021 5:38 AM

Top-ranking reply

dialabrain

Level 10

125,021 points

Posted on Mar 15, 2021 5:52 AM

A Late 2015 iMac does not support TDM.

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Target display not working

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