NUEVA Tarjeta de Video de Metal nVIDIA K1100M 2GB para iMac 11,1 / 11,2 / 11,3 / 12,1 / 12,2
IMac 11,1 needs to use external display to boot into MacOS, and run OCLP to build new OC, then internal display can work. So, you need a Thunderbolt / MiniDP to VGA / HDMI / DVI cable / adapter to get external display at beginning.