The graphics normally appears on the display when directly connected by VGA, while it cannot display the graphics sometimes connected by the hybrid Matrix. You should inspect the matrix-to-display cable, and try to change a cable for inspecting. Then check the distance to see whether it surpasses the maximum transmission distance supported by the signal. (If the distance is too far, adopt the signal amplifier for transmission. ) Besides, you could try to adjust the resolution of the hybrid matrix, inspecting whether it surpasses the best resolution ratio of the displayer. If so, it is possible to be incapable of displaying the signal, and then you should lower the resolution.