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User profile for user: Swaim
Swaim Author
User level: Level 1
60 points

Late 2015 iMac supports extended desktop but can't be used as an external monitor?

I have search the discussions and articles before asking this. It is clear that my iMac late 2015 can NOT be used as an external monitor for a MacBook. But the tech specs clearly say it supports "extended desktop" which is just that, is it not? This is from Apple:


"Video Support and Camera

  • FaceTime HD camera
  • Simultaneously supports full native resolution on the built-in display and up to two 4096-by-2160 external displays or one 5120-by-2880 dual-cable external display
  • Support for extended desktop and video mirroring modes"


So it can be transmit to two other displays - that's is clear, but the last line suggests it should be able to be used as a display.


Some mentioned setting up a virtual network as a work around I welcome's all advice. My iMac has Mojave, but I can go back to a prior OS if needed. I am looking to purchase a newer MacBook so i can get "2 for one" but using my iMac as a display for a bigger desktop type screen when at home. Thanks!!!

Posted on Aug 12, 2021 1:34 PM

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User profile for user: padams35
padams35
User level: Level 4
3,445 points

Posted on Aug 12, 2021 2:25 PM

"Extended desktop" refers to extending the 2015's desktop onto an external monitor (as opposed to screen mirror or using the external monitor as a separate space).


That line does not refer to using the 5K as a display for another computer.

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User profile for user: Swaim
Swaim Author
User level: Level 1
60 points

Aug 12, 2021 3:33 PM in response to den.thed

please carefully read > https://support.apple.com/en-us/HT204592


Thanks. As noted, I had read all the info (including this article). I just thought there might be a work around as I did NOT understand what "extended desktop" was; I could not find a description of what that meant. It is strange that this ONE model was left without that option when models before AND after support mirroring none fashion or other.

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Late 2015 iMac supports extended desktop but can't be used as an external monitor?

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