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iMac (5K, 27-inch, 2019) as extended display for MacBook Air

I'm trying to use my iMac as a secondary monitor for my MacBook Air. Both running Catalina (10.15.6). I have a thunderbolt adapter (USB-C to thunderbolt 2) from iMac with thunderbolt 2 cable from adapter to MacBook Air. The computers aren't recognizing the connection and arrangement tab in display is not available. I've contacted apple support several times and confirmed the adapter/cable connection is correct but no success. Is it possible to use the iMac as the secondary monitor???

Posted on Aug 26, 2020 7:50 AM

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Aug 26, 2020 1:06 PM in response to neeli803

No Apple here, just other users like you.


I think you got some bad info on your call.


You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display. Learn how to identify your iMac model.

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.

iMac (5K, 27-inch, 2019) as extended display for MacBook Air

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