I am trying to go into target display mode on my iMac. Its a 2012 iMac which does support TDM. However, I don't have a standard iMac keyboard because I bought a refurbished Mac which comes with a different keyboard & mouse. That being said, I can't use the Command + F2 key combination to go into TDM. How am I able to without doing that?


Have you tried all the steps recommended by Apple?

Use Target Display Mode

Follow these steps to start using your iMac as a display:

1   Make sure that your iMac is turned on, and the other Mac is logged in to a macOS user account.
2   Connect the Mini DisplayPort or Thunderbolt cable between the two computers.
3   Press Command-F2 on the keyboard of the iMac that you want to use as a display.

After you press Command-F2, your iMac displays the desktop from the connected Mac.

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 that the iMac you're trying to use as a display supports Target Display Mode. 
•   Target Display Mode works only when your primary Mac is logged in to a macOS user account. For example, if your first Mac is at the FileVault login screen, pressing Command-F2 on your iMac does not enable Target Display Mode. You must first log in to your Mac (using a regular display, if necessary) before you can use an iMac in Target Display Mode.
•   Make sure that 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 function keys," the key combination changes to Command-Fn-F2.
•   Make sure that 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 third-party keyboards 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.

If you are using a keyboard set up for Windows, EG a Windows logo key to the left and/or right of the space bark That is your Command key.

So pressing WindowsF2 should do what you want.

You must log in to answer this question.

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