How to use a late 2009 27" iMac as a display for a 2020 Macbook Pro?
I found this thread: https://discussions.apple.com/thread/8024535
It says my late 2009 27" iMac can be used as a second display for my 2020 Macbook Pro. It instructs me to use a Thunderbolt 3 (USB-C) to Thunderbolt 2 adapter and a Thunderbolt or a Mini DisplayPort to Mini DisplayPort cable.
I purchased the adapter and Mini DisplayPort cable and this configuration does not work. ON the box of the adapter in fine print it shows Mini DisplayPort in red with an X saying it is not compatible. That must be why it did not work for me.
So, apparently the adapter requires a Thunderbolt cable. However, I read on the Apple website that any Mac older than 2011 in not Thunderbolt compatible. So, does that mean I'm out of options? or Will the Thunderbolt cable work to activate the Mini DisplayPort?