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  • Macworld UK

    Help Desk

    Jan 14, 2022 6 minutes
    Glenn Fleishman reports

    WANT TO USE AN iMAC AS AN EXTERNAL MONITOR? YOU NEED AN OLD VERSION OF MACOS

    One of the most common reader questions we get is, “Can I use my iMac as an external monitor?” We previously provided an almost-comprehensive answer (fave.co/3a4jmi8) to the question before Apple restored a page on its site that offered technical details. The general answer is that only iMacs models shipped from 2009 to mid-2014 (the seventh- and eighth-generation models) had the right graphics circuitry for this Target Display Mode feature.

    Since then, many people have asked about what seemed to them a bizarre, unnecessary, and inaccurate requirement – that is sadly absolutely true. Does an iMac have to be running an old version of macOS as well to support Target Display Mode? Yes, it must. And so must the Mac connecting to it!

    Apple eliminated Target Display Mode support from macOS 10.14 Mojave. In order to use your iMac as

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