[shredder]

It sounds like your stb needs a set of 'signals' sent to it to basically refresh it, yours is one of the more common faults we get. Just double check you have the card in the bottom slot with the gold chip facing downwards. If that's all correct call faults now, they're open til 8pm. Let us know how you get on, good luck!
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sorry i miss read that, if you still have some channels it's unlikely to be the card, but the call to faults and the signals still apply