I need to convert DVI-D to either VGA or BNC of a Mit big screen. The DVI-D is comming from a HD Dish Network receiver. The display is a 70" Mit big screen. The Mit only has a RGB and BNC. I don't remember the exact lettering for the BNC but it's the same as the old Mac monitors that have 5 BNC jacks. How can I interface the two without buying a 300+ converter for DVI-D to VGA. The reason for going to VGA is that I already have a VGA to BNC cable that I am using for the old HD receiver I am replacing. Also, I can not use the RGB since it will only sync to 480.