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Mid 2010 27-inch iMac as an external monitor

Hi everyone!


I have an old mid 2010 27-inch iMac (macOS High Sierra 10.13.6, cannot be upgraded anymore) with a Mini DisplayPort. On the other hand, I have a Windows laptop (Lenevo IdeaPad 710S Plus) with a USB Type-C DisplayPort.


I'd like to use my iMac as an external monitor of my Windows laptop, is that possible only with this cable please? If not, what kind of cable(s) can I buy for this purpose?


Thank you so much for your help!

Posted on Jun 30, 2021 10:38 AM

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Question marked as Top-ranking reply

Posted on Jun 30, 2021 10:46 AM

Hello, celine994.


Here are the rules for Target Display mode on iMac:

click> Use your iMac as a display with target display mode - Apple Support


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


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.



Not sure if that can be done from a Windows PC at all.

You should remember that the iMac is a computer. It really was not designed to be just a monitor.

Good luck and happy hunting, though.

6 replies
Question marked as Top-ranking reply

Jun 30, 2021 10:46 AM in response to celine994

Hello, celine994.


Here are the rules for Target Display mode on iMac:

click> Use your iMac as a display with target display mode - Apple Support


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


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.



Not sure if that can be done from a Windows PC at all.

You should remember that the iMac is a computer. It really was not designed to be just a monitor.

Good luck and happy hunting, though.

Jun 30, 2021 10:46 AM in response to celine994

Welcome to Apple Support Communities.


There is a very small chance it will work right if at all. Granted, these 2009/2010 iMac models could maybe have the function you want, but it is cumbersome to use and often doesn't work right if at all.


I would simply buy an external display. It is far more reliable than this solution, and it always works.


-Jack

Jun 30, 2021 10:49 AM in response to celine994

Although the 2010 iMac 27" was part of a very limited set of iMacs that could be an external monitor for another Mac, Apple never intended it to be compatible with non-Apple devices. Some people have been "accidentally" able to make this work using 2009 and 2010 27" iMacs on older Windows notebooks with MiniDisplay ports, but it may well not to a newer one with USB-C.


So, for the cost of the needed cables and adapters for an experiment that may fail, you can buy a really nice external monitor. It will be easier to set up, allow an extended desktop, and use far less energy than a second computer running at full tilt. The iMac has to be fully powered and the 2010 models did not exactly sip energy (265W while working).

Mid 2010 27-inch iMac as an external monitor

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