Cannot use 2011 Mac as external display for 2017 MacBook Air
Trying to use my old 2011 Mac High Sierra as a monitor for 2017 MacBook Air Monterey with thunderbolt cable. Can’t seem to get it to work.
Any ideas?
it does not work with Monterey (macOS 12.7.6) "macOS Catalina (macOS 10.15.7) or earlier installed"
from
Use your iMac as a display with target display mode - Apple Support