Can an iMac (Aug 2011) be used in target display mode with my MacBook Air (2012)?

I want to use an Aug 2011 iMac (21.5 inch) as a second display with a new Mac Book Air.
Is this possible with a Thunderbolt cable?

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Apple Thunderbolt Cable (0.5m) - White

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3 Answers from the Community

  • Best Answer:

    You can use any iMac with a Thunderbolt port as an external monitor for another Mac that has a Thunderbolt port as well. If you have the education-only model of the 21.5" iMac that started selling in august of 2011, you're out of luck, because it has not Thunderbolt port.

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  • No only the 27 inch can be a display. Not the 21.5.

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  • Yes you can. I am using mine right now. Just make sure you have the latest OSX update installed.

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