Quote:
Originally Posted by Tomsjotun
Im trying to use my old iMacs (2009, 2013) as external screens to my MacBook Pro.
The 2009 works automatically but the 2013 wont work.
I have tried to switch cables between the two, but only the 2009 works.
Any ideas?
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'Target Display Mode' does NOT use DisplayLink technology. As a result, DisplayLink will not be able to assist you.
That said, Apple has very specific requirements in order for Target Display Mode to work as they describe here -->
https://support.apple.com/en-us/HT204592
If that information doesn't help, I would suggest contacting Apple directly for assistance.