Target display mode not working / iMac 27inch + MacBook Pro

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catja225 Author

Level 1

8 points

Target display mode not working / iMac 27inch + MacBook Pro

#TargetDisplayMode #iMac #MacBookPro

Hi, I am trying to connect as 2nd screen my

iMac 27-inch, late 2009 running on 10.13.6 high sierra

and

MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports) on 10.15.4 catalina

I am using original cables from apple: thunderbolt 3 (USB-C) to thunderbolt 2 with thunderbolt..

command+F2 (command+FN+F2) not working. scanned forum after forum but can't find the issue / ways to fix, anyone any solution?

iMac, macOS 10.12

Posted on May 27, 2020 3:15 PM

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Answer 1

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catja225 Author

Level 1

8 points

Jun 8, 2020 3:16 AM in response to Grant Bennet-Alder

Thank you for your help. Finally managed to connect the two!:

iMac (27-inch, late 2009) + MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports)

Apple does not have the necessary cables, however, this works:

LMP USB-C adapter Mini-DisplayPort

LMP Mini-DisplayPort Cable Mini-DisplayPort

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Answer 2

brenden dv

Community Specialist

May 28, 2020 10:07 AM in response to catja225

Hello catja225,

Thank you for using Apple Support Communities.

I understand that you are trying to use an iMac 27-inch (late 2009) as an external display using target display mode. I would recommend taking a look at the following support article to setup and then troubleshoot using your iMac as a display.

Use your iMac as a display with target display mode - Apple Support

Best regards.

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Answer 3

May 28, 2020 10:13 AM in response to catja225

You can not use the Apple ThunderBolt-3 <--> ThunderBolt-2 adapter For any displays EXCEPT genuine thunderBolt displays. it does NOT provide a workable Mini DisplayPort signal.

This adapter is not compatible with displays that use DisplayPort or Mini DisplayPort, such as the Apple LED Cinema Display. Thunderbolt and Thunderbolt 2 are not the same as Mini DisplayPort , though the ports have the same shape.

from:

About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple Support

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Target display mode not working / iMac 27inch + MacBook Pro

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