HDMI from DVD to TV not working

TV which is mid-ship in coach has 2 HDMI cables running to it from a cabinet over the pass seat.

1 from the sat box
1 from the DVD player

Cabinet over pass seat contains the satellite box and the DVD player

Both worked fine prior to installing the traveller

Now the sat box feeds TV fine but the DVD player does not show video on the TV.

So, what I know
either HDMI hooked to the satellite box plays on the TV - so both HDMI cables are good and have continuity to TV

neither HDMI hooked to the DVD plays video on the TV - but the component out from the DVD which feeds a front TV shows video fine and the sound plays through the surround sound system fine.

In reading up on HDMI, I understand that the unit and the TV have to complete a "handshake" to allow video on the TV. Does anyone know the correct procedure to re-establish the handshake?


It is a DVD player from RCA and a Sharp TV

Thanks for any brilliance you can provide
Tom - 2011 HR Endeavor 43DFT