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  • Why do you think this will work? Do you have a specific source suggesting that it does? These are two different computers. You are trying to treat one of them like a monitor. That is not how it works. If you want a second monitor then you need a monitor and plug it in to some of the ports you mentioned. Commented Apr 27, 2018 at 13:43
  • Given the design of iMacs, which look at first blush just like a regular monitor, it is not unreasonable for someone to think "I could probably use this thing that looks like a monitor as a monitor" :)
    – bertieb
    Commented Apr 27, 2018 at 14:11
  • Ironically, it was working with a display port cable. The arrangement feature showed. Applecare thinks I have a faulty cable and suggested a different attachment and cable. So if it's not supposed to work, why did it? And, why does the arrangement feature under display show up?
    – user899409
    Commented Apr 27, 2018 at 14:23