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Using MacBook Air with iMac as an External Monitor

Hi there:


I have a Macbook Air (M1, 2020) and I have an iMac (21.5" 2017). I'd like to use the iMac as an external monitor when I want a bigger screen. I'm struggling to use a thunder cord or even a USB-C to connect the two computers as it appears as if they don't want to talk to one another. Is there a way to do this or are they incompatable? Can use screen share without connecting any wires (like a sidecar or airplay)? Someone lend me a hand and let me know how to do this, please.

MacBook Air 13″, macOS 11.1

Posted on May 10, 2021 1:42 PM

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Question marked as Top-ranking reply

Posted on May 10, 2021 1:48 PM

Hi historyprof1210,


Sorry, but it simply cannot be done. No method supports it.

  • The 2017 iMac is too new.
  • Apple Silicon Mac models doesn't support Target Display Mode.
  • macOS Big Sur doesn't support Target Display Mode.
  • You can't use Sidecar.


Cheers,


Jack

1 reply

Using MacBook Air with iMac as an External Monitor

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