Q: Use iMac as second display for MacBook Pro
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Oct 1, 2015 4:22 PMby norm123,HelpfulHey Graham,
I understand that you recently upgraded to El Capitan and now you are getting Target Display to work with your iMac. Let's see if we can get that sorted out.
To get you started, take a look at the article below. It has a section on some general troubleshooting when the commands do not work. I would look at 2 options that I put in bold as the others you might have done. If you have not done some of them, look at those options as well.
Use your iMac as a display with Target Display Mode
https://support.apple.com/en-us/HT204592
If Command-F2 doesn't work
If your iMac doesn't switch to Target Display Mode when you press Command-F2, check these things:
- Make sure the iMac you're trying to use as a display supports Target Display Mode.
- Make sure you're pressing Command-F2 on the keyboard that's connected to the iMac you want to use as a display.
- In Keyboard System Preferences, if the checkbox is enabled for "Use all F1, F2, etc. keys as standard functions keys" the key combination changes to Command-Fn-F2.
- Make sure your Mini DisplayPort or Thunderbolt cable is connected to both computers.
- If you're currently logged in on the iMac you want to use as a display, try logging out to return to the login window. Then press Command-F2 again.
- Some older Apple keyboards and keyboards not made by Apple might not allow Command-F2 to toggle display modes. If this happens, use the Keyboard that came with your iMac to toggle Target Display Mode on and off.
- If your iMac is currently started up in Windows, it won't enter Target Display Mode. Target Display Mode isn't supported in Boot Camp.
Take it easy -
Oct 1, 2015 4:31 PMby grahamfromdee why,Hi norm123,
Thanks for your input. I had previously checked
- In Keyboard System Preferences, if the checkbox is enabled for "Use all F1, F2, etc. keys as standard functions keys" the key combination changes to Command-Fn-F2.
and that didn't have an effect. So I tried your second recommendation
- If you're currently logged in on the iMac you want to use as a display, try logging out to return to the login window. Then press Command-F2 again.
and the problem is fixed.
I thought I had already tried the second suggestion, but maybe I was wrong.
You know how when you have a problem and you try all kinds of solutions and when you finally fix the problem you are not sure what it was you did that worked.
Anyway, the problem is fixed and your input was appreciated.
Regards,
Graham
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Aug 11, 2016 6:59 AMby hmjbarbosa,Dear Norm and Graham,
I am trying to start using my iMac as a secondary display to my MacBook Air and it does not work. It is not exactly the same problem as Graham's, because I didn't use it before upgrading to El Captan.
Anyway, I already tried all the suggestions in the support article sent by Norm, particularly the two itens in bold face. None worked.
The system I want to use as monitor:
iMac 27-in Late 2012, running El Captain 10.11.5
Graphics NVIDIA GeForce GTX 660M 512MB
My laptop:
MacBoor Air 13-inch Mid 2013, running El Captain 10.11.4
Graphics Intel HD 5000 1536MB
Hitting Cmd+F2 or Cmd+fn+F2 or fn+Cmd+F2 on the iMac does not work. There is only an error sound.
Logging out and in again, then trying TDM don't work.
Logging out and trying TDM while on the login screen, also doesn't work.
Any other ideas?
Henrique
