iMac 27" Late 2012 Target display mode not working
I have iMac 27" Late 2012. I'm trying to access target display mode while connecting by HDMI from video source but nothing happens when I use command + f2.
iMac 27″, macOS 10.14
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An iMac used as a second monitor must be running no higher macOS version than 10.13. From your equipment line, yours appears to have 10.14.
Here it Apple information and requirements for Target Display Mode:
Use your iMac as a display with target display mode - Apple Support
Note Apple have archived that article.
