If that handshake isn't being met, in effect your audio video devices will stop communicating with one another and the HDMI signal might fail or repeatedly drop out. However - these additional communication signals between your devices need to repeatedly complete successful 'handshakes'. These additional signals are designed to provide better compatibility and security between the devices on your home entertainment / AV system. Among other things it also includes EDID (Extender Display Identification Data) and HDCP (High Bandwidth Digital Content Protection). Try changing the HDMI input - Your HDMI video signal includes more than just video and audio signals.

(We're all guilty of it!) It could be the power's not been switched on and, therefore, no signal can pass through. And also - as simple as it sounds - check that the power to your source device is switched on of course. This brings us to the first point of our top tips to start with - to check the basics!Ĭheck your HDMI cables and connections - Make sure that everything is seated in the right place, plugged in where it should be, connected properly. 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.

Hdmi from mac to tv no picture