Help with HDMI input 6 on Krp-600m, can't select it :(

Hi,


Just got myself a new 600m UK version, hooked up my satellite via hdmi input 5 and xbox 360 via hdmi input 6, however the panel will not let me select input 6


Swapped inputs round and still can only select input 5 and not 6


Do i need to enable this input and how?


Thanks.


EDIT.


Sorted it, HD AV converter was on, what is this option anyway?


Thanks.