I have in input AV (1,2,3) HDMI (1,2,3) COMPONENT, PC, TV. My Tv is connected to virgin hd+ box by HDMI cable and the tv works really well. However, when I try to use tv on just roof arieal I cannot get the intergrated freeview the onlything I get are the basic 5 channels. which input should i be chosing and why am i not getting the freeview? any ideas out there