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I currently have:

  • 2019 MBP on MacOS 10.14.6
  • 2012 iMAC on MacOS 10.14.6 (thunderbolt 2)

I am connecting them to each other using a Thunderbolt 2 to Thunderbolt 3 adapter, both of which are brand new.

I was able to trigger target display mode ONCE. Then cmd + F2 stopped responding entirely. Things I've tried:

  • reset the PRAM/NVRAM on both devices
  • cmd + F2 + fn
  • every combination of the ports on each end
  • booted the iMAC in safe mode (can't do it on the MBP; it's a work laptop)
  • tried initiating TDM by connecting iMAC to MBP 2014, still no dice on cmd + F2

I've perused all the Apple support pages and similar stackexchange questions to no avail and now I'm at my wit's end. Did anybody face something similar and was able to resolve?

  • do you have a Retina display. According to one source Target display mode not available on iMacs with retina displays. – jmh Jun 10 at 21:34

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