Hi, I have a beovision 4 with beosystem 2 to which I am trying to connect a sky HD box along with a mac mini. The panel setup has been configured to use decoder for the dvi-d connector and av for the vga connector. With this setup I can chose STB (DTV/DVI) on the decoder input (which works fine) but I cannot chose PC(VGA) on the AV input. If I change