crwdns2934241:0crwdne2934241:0 Artan Spahiu

crwdns2934249:0crwdne2934249:0:

AMD Radeon HD 6750M 512 MB graphics, this card have not signal on thunderbolt port. my mac is iMac (21.5-inch, Mid 2011,    High Sierra version 10.13.6. full update on 10/09/2020.

can you help me to resolve this problem? I need to connect second display with this machine

thenk you

crwdns2915684:0crwdne2915684:0:

open