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External monitor

How do I use my 2009 iMac as a monitor for my new 2020 MacBook Air

MacBook Air 13″, macOS 10.15

Posted on Sep 17, 2020 6:28 PM

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Level 7

23,059 points

Posted on Sep 17, 2020 7:02 PM

The 2020 MacBook Air does not support Target Display Mode with a Thunderbolt iMac

"You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display."

but it may work with a 2009 iMac if it's 27". It won't work with a 21.5" iMac. You will need a USB-C to Mini DisplayPort cable, such as:

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