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I am in direct contact with a very helpful (and seemingly persistent) 2nd line Apple Support employee about this now, so fingers crossed. I'm not sure how the retina MacBooks work using target display mode on the late 2009 iMacs. This was designed specifically for people wanting to use their iMacs in target display mode, and works especially well in situations where you want to connect a MacBook to the iMac.

You may need to adjust the resolution on your MacBook to a lower setting. So the problem seems to be limited to the new 2020 MBP. I have connected a MacBook Air with a Thunderbolt port to a late 2009 iMac using the mini display port cable.

It also still works fine when I connect the Thunderbolt cable (directly) to my old MBP.Īny ideas what I can do to debug the problem?Įdit: I tried it out with a colleague's MBP 2017, same cable and adapter, and it worked flawlessly. I can already rule out the cable/adapter/USB-C port being defective, because I've used for transferring files from the old MacBook to the new one successfully. But when I press Command-F2, nothing happens, like they aren't connected. I have it connected with an official Apple Thunderbolt 2 cable and Thunderbolt 2 to USB-C adapter. The new MBPs with USB-C are supposed to work with Target Display Mode, using the Thunderbolt 2 to USB-C adapter. Last week, I upgraded to the 2020 MBP 13". I am using a 2011 iMac as an external monitor (and speakers) for my MacBook Pro (2014) on a daily basis. Im planning to use my 2009 27' in target display mode for a gaming PC, I know that the USB ports on the back of the iMac will not be seen by the PC but what if I were to run a USB A to A cable between the PC and the iMac, would the PC then see the USB ports on the back of the iMac as a USB hub.