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Level 1

8 points

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

Posted on Nov 19, 2020 4:24 AM

Top-ranking reply

Level 7

23,059 points

Posted on Nov 19, 2020 5:43 PM

"You can connect any of these older iMac models to another Mac from 2019 or earlier for use as an external display."

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