I have a Saphire Radeon HD 7950. I also have 3 LG 27" Monitors, all 3 are same model. I have 2 Mini DP to HDMI Converters, 1 DVI and 1 HDMI. When I go into Catalyst Control Center I can see all 3 displays but I can only create a desktop or multi display group with 2 monitors. What do I need to do to get the 3rd monitor working?