Needing some advice please. Just got a TH37PX80-B from JL price matched from S&V - for £599 happy days - after reading so many good things about this set on these pages . Its gives a good freeview picture and good picture from DVD , I have a Toshiba SD360E and I get a picture fine from SCART leads , I've just got a QED HDMI performance cable for it to take advantage of the better picture quality , and the problem is that when I plug in the HDMI cable and unplug the SCART then I done get any picture at all , just a black screen ????? . Looked though the owners manual and looked at all the settings, can't find anything wrong. Am I missing something really easy here ?? - thanks for any advice in advance.