NUEVA tarjeta de video metálica nVIDIA K1100M 2 GB 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.