It could be something as simple as a loose connection on the back of the AV source device, or just a simple cabling issue.
If your HDMI audio video signal is faulty, not working or repeatedly dropping out - then don't panic! - there's probably nothing drastically wrong. What to do when there is no video signal? Here are some simple fault-finding solutions when your HDMI input doesn't give you an image. But what happens if the picture disappears, or even worse, no picture appears in the first place? When it comes to connecting an AV source such as your Sky TV, Blu Ray player or Xbox to your TV or display, it's more than likely that the video cable you'll be using is a HDMI cable.
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