wondering if you can use a late 2013 iMac as an external monitor to a 2020 27inch iMac.i spoke to the office supplies tech guy who recommended a thunder port 2 cable but that fits in the 2013 not the 2020 which is a thunderbolt 3! Can this be done? I know there seems to be all sorts of caveats for different models. What I think I need is a cable with a thunderbolt 3 on one end and a thunderbolt 2 in the other but as they don’t seem to exist...any suggestions would be greatly appreciated!!
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Since I am using a iMac (21.5 inch, Late 2013) in Target Display Mode, I can state this works with macOS Catalina version 10.15.7 for video but not for sound. If you also need sound, then install High Sierra. – David Anderson Jun 24 '21 at 13:26
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Apple sells a Thunderbolt 2 to Thunderbolt 3 Adapter.
Then you only need a Thunderbolt 2 male to male cable to connect it and a keyboard to boot the iMac into target display mode.
Other adapters might also work, but the Apple one is pretty much guaranteed to work.
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