I have got a 4210 and it has a twin screen facility. Screen 1 is ok and has the label scart 1, but screen 2 is black. How do I go about getting the screen 2 to show a picture?.. Do I need a second scart or is it a tuning thing via the menu or WOT...? I must be a bit more dinny than I think as I cannot get any sense from the user manual. Thanks in advance for help and suggestions...