Target Display Mode not working
It feels like I have read all the threads on this, but have not come to a solution.
Problem:
All I can get the iMac to do when pressing Cmd+F2 is either to make an error sound or to flash (in Safe Mode).
Setup:
. MacBook Pro 13" 2020, macOS 10.15.7 (Catalina) as source
. iMac 27" late 2012, macOS 10.13.6 (High Sierra) as target
. Thunderbolt 3 (Usb‑C) to Thunderbolt 2 adaptor
. Apple Thunderbolt cabel
I have:
. started both machines in Safe Mode
. tried resetting the PRAM/NVRAM on both computers
. reset SMC on iMac
. tried connecting in iMac lock screen
. reconnected cables (to different ports)
I am lost. Any suggestions are welcome.
Best, Nils
MacBook Pro 13″, macOS 10.13