Command F2 not working after upgrade to Sierra

I have been using my 27" iMac as the target display for my headless Mac Mini for years ... with the latest being El Capitan. After upgrading to Sierra, I can no longer use Command F2 to switch to target display mode. Pressing Command F2 now just shows a black blank screen. I can toggle it back to iMac display ... so seems that the Command F2 toggle is working but just that the display doesn't show up.

Anyone with this same issue?

iMac, macOS Sierra (10.12), Menubar Clock

Posted on Oct 4, 2016 6:02 PM

31 replies

Oct 11, 2017 2:33 AM in response to Tim.T

Tim, that is interesting. It seems like a terrible oversight. Luckily, I don't see that in my 2011 iMac.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Command F2 not working after upgrade to Sierra

Welcome to Apple Support Community

A forum where Apple customers help each other with their products. Get started with your Apple Account.

Learn more Sign up