No digital tv signal message

When i switched my tv on i got a message saying that there is no digital tv signal found. It had another message undeneath which gave me 5 minutes before the tv switched off. I couldn't move from this screen which means I cannot access settings to try and fix any problems myself. I have looked through the guide and online and this problem does not seem to come up. Any help is appreciated. 

This sounds more of an issue with your televison rather than the YouView box.
How is your YouView connected to your TV - SCART or HDMI?
I assume that you have the aerial connected to the YouView box antenna-in. Do you also have the antenna-out on YouView connected to your TV's aerial connection?
Is this the first time you've had this issue?
Is the YouView box powered on?

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