atv function

[edinburhgcolin]

hi can anyone help,

on returning from a weekend away i found that the tv function is no longer available, this is the function that my sky comes through, i have the sky box feeding 2 rooms and it is fine in the other room on a different tv so i know its not a sky issue, also the tv is getting digital so it is not an arial issue. the atv option is still there but a light grey colour not bold black like the other settings

any suggestions?