Late 2012 iMac (27 inch) monitor to use with M2 Mac mini
What cables do I need to use to get this to work as a monitor
iPhone 15 Plus, iOS 18
The M2 Mac mini does not support using the Late 2012 iMac as a display in Target Display Mode.
carefully read > Use your iMac as a display with target display mode - Apple Support
If you get or have an M2 Mac mini, then you will need to use an External Display or HDMI TV.