Using old iMac as a Secondary Monitor Apparently No Longer Works

Apparently, although the hardware obviously can support this, in Mac OS Monterey (and maybe earlier), Apple has taken away this feature.

There was an article: https://support.apple.com/guide/mac-h... that provided details on this but that article no longer exists.

Target Display Mode was not supported on iMac models with Retina display.

Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) supported Target Display Mode.

On an Apple Keyboard: Command-F2 would put your old iMac into Target Display Mode.
On an Anker Keyboard: Command-F3 would do the same.
old iMac into display mode!

Instead of buying the ridiculously expensive Apple cables, this $15 cable: https://amzn.to/2HlrZtR should work.

But of course, if you've upgraded your OS, none of this will work.


Using an old iMac as a Secondary Monitor No Longer Works