Why won't my 2012 iMac won't work as a monitor with a thunderbolt cable for my 2015 MacBook?
I'm trying to use my iMac (27-inch, late 2012, running Catalina version 10.15.4) as a display screen for my MacBook (retina, 13-inch, early 2015, running Catalina version 10.15.4) using a Thunderbolt cable to join the two.
Whenever I press CMD & F2 to sync up the screens the iMac screen goes black, but the MacBook screen changes its display to look like it has hooked up to the iMac (everything looks a lot smaller on the MacBook screen).
Any help would be much appreciated, thanks!
iMac 27", macOS 10.15