The HDMI cable is connected to the Direct tv box. If I hook up the Direct TV box with component video to a component video input, it works, with the HDMI to component Video cable, it does not. I have not tried to hook up the Mac Mini with a DVI to RGB Adaptor and then RGB directly into the projector. My feeling is it will. Are these other inputs "Digital" where as Component Video and RGB are "Analog and wont communicate?