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    Mac 911

    Dec 21, 2021 7 minutes
    BY GLENN FLEISHMAN

    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 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 a display, it has to be both the correct model year and have macOS 10.13 High Sierra or an earlier version of macOS (or Mac OS X) installed.

    The Mac that uses the display of an iMac of the correct vintage with the

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    EDITORIAL DIRECTOR Matt Egan EDITOR IN CHIEF, CONSUMER BRANDS Jon Phillips DESIGN DIRECTOR Robert Schultz EXECUTIVE EDITOR Michael Simon SENIOR EDITOR Roman Loyola STAFF WRITER Jason Cross SENIOR CONTRIBUTORS Glenn Fleishman, Rob Griffiths, Joe Kisse
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