If you are using HDMI, & you are seeing all the menu pages, including the channel mini-guide, but no pictures then the usual cause is the HDCP handshake with the TV. This is a copy prevention measure that ensures the equipment connected is a viewing device & not a recording device, but it is not infallible. Try another HDMI lead, the normal re-boots etc. Also try changing to another HDMI socket if the TV has one.
Cable customer since 1993. Services: FH TV, Sky Sports & Movies (2xV+), Talk Unlim Telco, VIVID 100, Virgin PAYG Mobile