The case of the iMac screen that mysteriously blacks out | Macworld
Old iMac as a monitor - instructions for screen synchro »Sir Apfelot
Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
Alter iMac als Monitor - Anleitung für die Bildschirm-Synchro » Sir Apfelot
Apple iMac Modellreihe Oktober 2009 Test | Testberichte.de