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target display mode

Hello! I am trying to use my mid 2010 21.5" iMac with High Sierra 10.13.6 as a target display for my Mac Book Air 2017 also with High Sierra 10.13.6. I have a mini display cable connecting both computers, but the target display does not seem to work. I tried all the tips from the website, but still no luck. Anything else you would recommend?

iMac 21.5″, macOS 10.13

Posted on Jul 15, 2021 2:15 PM

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Posted on Jul 15, 2021 2:31 PM

The iMac (21.5 inch, Mid 2010) model cannot be used as an external display. Here is an article with more information.


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target display mode

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