Eurovox no signal on terrestrial channels 14.07.09?

Starting today 14.07.09 i am unable to pick up any of the terrestrial channels BB1,2, Channel 3,4 and 5 and also the freeview channels. All other channels ok. I am either getting no signal or the screen flickers.
I have tried re scanning, switching off box, checking cables but nothing works. Can anyone help
Cheers Peter