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?

Apple Thunderbolt Cable (0.5m) - White

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2 Answers from the Community

  • Answer

    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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