I'm trying to connect a second monitor to my computer, I'm using an ATI Radeon HD 6850 Graphics card and i'm trying to connect a Dell monitor and a Sony monitor. The problem I've run into is that it doesn't think that one of the monitors is connected when i have them both connected. I've tried them both separately and the cords and monitors work just fine alone. I'm thinking maybe it's the other port in my graphics card not working? I've tried installing the drivers for the graphics card from the site and from the disc that came with my computer, Nothing is working, Please help.