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Level 1

4 points

Monitor

I have a 21.5(2010) IMac and want to add another 21.5 IMac as a second display monitor. Is this possible

iMac 21.5", macOS 10.13

Posted on May 24, 2020 7:46 AM

Top-ranking reply

Level 10

245,261 points

Posted on May 24, 2020 8:35 AM

THe 2010 21.5" cannot be used as the Target Monitor...

27-inch iMac models introduced in 2009 and 2010: Use a Mini DisplayPort cable to connect your iMac to a Mini DisplayPort or Thunderbolt or Thunderbolt 2 port on the other Mac.
All iMac models introduced in 2011, 2012, 2013, and mid 2014: Use a Thunderbolt cable to connect your iMac to a Thunderbolt or Thunderbolt 2 port on the other Mac. If the other Mac uses Thunderbolt 3, you can use the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter with your cable.

Target display mode requires macOS High Sierra or earlier on the iMac used as the external display. It does not work with macOS Mojave or later.

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