So if the primary MacBook is on the login screen, there won't be any change on the iMac screen The Mac, usually the MacBook, that you want to project screen to iMac, must be logged into a user account for Targetĭisplay Mode to work. Solution 2: Log Your MacBook in User Account Otherwise, iMac targetĭisplay Mode could not work. Make sure you have used the right cable to connect the compatible Macs via the right port. To plug into the Thunderbolt port on a MacBook. Of a MacBook for iMac released on 2011/2012/2013/2014, you need a Thunderbolt cable To use Target Display Mode on iMac released on Late 20, you need a MiniĭisplayPort to Mini DisplayPort cable to connect the iMac to the Mini DisplayPort or Thunderbolt port According to Apple, iMac models that can be used as an external monitor include:

Not every iMac can be used as an external display, for example, 27-inch Retina 5K iMac and later model doesn't Solution 1: Check If Your iMac Is Target Display Mode Supported

macOS software problem, which can be fixed by a macOS update.

Your keyboard doesn't support Command-F2 combination.

Your iMac is not logged into a user account or your iMac is currently starting up on Windows.

Your iMac or MacBook doesn't support Target Display Mode or the cable you are using Target Display Mode is not working probably because of the following reasons: How to Record Screen on Windows and Mac - Simple and Clear You may also want to record Mac screen, read: IOS Screen Mirroring: Project iPhone Screen to PC You may want to mirror iPhone to PC, read: You can also use iMac as a second display for Windows PC, read:

Entering safe mode on mac pro