I have a Mac book pro (13 inch late 2013) and I have an old iMac (27 inch mid 2010).
I checked on apple website and it says that the 27 inch Mid 2010 model does support target display mode
https://support.apple.com/en-us/HT204592
It says that target display mode is supported but I need a "mini display to mini display cable"
but when I look at my MBP, it does have any mini display port. it has only 2 thunderbolt ports.
So will I be able to use the old iMac as a external display?