TV powers on but only get a grey screen - no menu or sound

TV powers on but only get a grey screen - no menu or sound

I have a refurbished Samsung UN32J400DAF 32" 720p 60 CMR LED HDTV which I have had less than 2 months. The TV will power on fine and when it comes on I only get a 'grey' screen, there is no sound and no menu

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