I have an iMac 21.5" Mid 2010 that has a miniDisplayPort on the back. Is there any way to connect a Mac laptop (either a mac with Thunderbolt 1 or 2 or 3 port or a Macbook 12” with USB-C port) with a cable (such as a MiniDisplayPort to MiniDisplayPort Cable) to my iMac that uses Windows 10 (not Parallels, just Windows 10).

I’d use this to use my iMac as an external display for troubleshooting Macs that have display issues.

Any help much appreciated.

1 Answer 1


No, it cannot be done while the iMac is running Windows 10 natively.

The feature you're looking for is called "Target Display Mode". It only works when the iMac is booted into macOS.

You can read all about how the feature works and its requirements here:


  • I now learnt it can be done installing an app on both machines and they'd communicate through Internet using Virtual Network Computing (VNC) technology (known apps are ScreenRecycler and Synergy). Thanks for your answer. Commented Mar 9, 2019 at 21:49
  • Yes, ofcourse that is always an option. VNC isn't the best available for that purpose, but it is usable. However it is not nearly like a "second monitor". You'll notice lagging, compression artifacts, color problems, etc. If you're using it to display your calendar - all is probably going to be okay. If you're using it to play 3D games, you're going to be severely disappointed.
    – jksoegaard
    Commented Mar 9, 2019 at 23:48
  • Thanks for your answer. all I want is to be able to check files, settings, etc. Commented Mar 12, 2019 at 5:35

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .