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iMac as external Display

I would like to use an iMac 24 inch (Early 2009, running El Cap) as a monitor for my MacBook Air (mid 2011 version running High Sierra). is it possible and what do I need?

Posted on Nov 3, 2021 9:10 AM

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Question marked as Top-ranking reply

Posted on Nov 3, 2021 9:56 AM

Sorry, no TDM will not work on an early 2009 iMac. Please refer to Apple's instructions in Target Display Mode.

6 replies

Nov 3, 2021 11:11 AM in response to JustAsk1ng

Please re-read it, it should be clear but sometimes looking it over again can clarify.


Bottom line though is TDM is basically a dead technology. It worked for a very small subset of iMacs and is no longer support. My suggestion is if you need an external display, please buy one. Why, simple they are MUCH more reliable than TDM every was, they are simple to setup and do not require expensive cabling, and they are inexpensive starting at less than $100.


Please don't waste your time or efforts on something that simply will not work.

iMac as external Display

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