Silly question, but you do have the aerial in?
Is it the 4k box or the TV hub?
Try resetting it,4k box you press the button on the left hand side 5 times, the TV Hub you choose factory reset from the settings menu.
Please remember to mark Solved Posts with Best Answer. Doing so helps other customers and saves TalkTalk's Support Team time by only looking at unsolved topics. Thanks, Steve (a fellow customer).
