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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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Question marked as Top-ranking reply

Posted on Sep 17, 2020 7:02 PM

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

Use your iMac as a display with target display mode - Apple Support

"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:

https://www.startech.com/en-us/audio-video-products/cdp2mdpmm6b

2 replies
Question marked as Top-ranking reply

Sep 17, 2020 7:02 PM in response to Applecommunity2004

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

Use your iMac as a display with target display mode - Apple Support

"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:

https://www.startech.com/en-us/audio-video-products/cdp2mdpmm6b

External monitor

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