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User profile for user: Lexx3001
Lexx3001 Author
User level: Level 1
4 points

Please Help connect 2 different iMacs together

I have 2 imacs: iMac (Retina 5K, 27-inch, Late 2015) with Catalina and iMac (Retina 5K, 27-inch, 2019) with Big Sur). I am trying to connect them via Thunderbolt. I have tried 2 cables so far: Thunderbolt 3 from iMac 2019 into Thunderbolt 2 (adapter) to iMac 2015. Also Thunderbolt 3 to Mini display cable. Both of these didn’t work. Is there something I’m missing?


iMac 27″, macOS 10.15

Posted on Nov 7, 2021 11:04 AM

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User profile for user: D.I. Johnson
D.I. Johnson
User level: Level 7
27,203 points

Posted on Nov 7, 2021 11:12 AM

Why are you trying to connect them?

Are you trying to use one as a display for the other?


Target display mode is a feature that was available only with certain older iMac models.

It is no longer a function supported by Apple in either hardware or software.


Only the following older iMac models can be used as an external display when plugged into another older Mac model:

  • iMac models introduced in 2011, 2012, 2013, and mid 2014 using Thunderbolt or Thunderbolt 2 cable.
  • 24-inch and 27-inch iMac models introduced in 2009 and 2010 using Mini DisplayPort cable.
  • The intended target iMac must be running macOS 10.13 High Sierra or earlier; it does not work with macOS 10.14 Mojave or later, or with Boot Camp and Windows.
  • Retina display iMacs won’t work as target displays.
  • In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.


click> https://support.apple.com/en-us/HT204592

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User profile for user: D.I. Johnson
D.I. Johnson
User level: Level 7
27,203 points

Nov 7, 2021 11:12 AM in response to Lexx3001

Why are you trying to connect them?

Are you trying to use one as a display for the other?


Target display mode is a feature that was available only with certain older iMac models.

It is no longer a function supported by Apple in either hardware or software.


Only the following older iMac models can be used as an external display when plugged into another older Mac model:

  • iMac models introduced in 2011, 2012, 2013, and mid 2014 using Thunderbolt or Thunderbolt 2 cable.
  • 24-inch and 27-inch iMac models introduced in 2009 and 2010 using Mini DisplayPort cable.
  • The intended target iMac must be running macOS 10.13 High Sierra or earlier; it does not work with macOS 10.14 Mojave or later, or with Boot Camp and Windows.
  • Retina display iMacs won’t work as target displays.
  • In all cases the source Mac that you're connecting FROM must have been introduced in 2019 or earlier and have macOS 10.15 Catalina or earlier installed.


click> https://support.apple.com/en-us/HT204592

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Please Help connect 2 different iMacs together

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