I've just bought a Sharp LC 26GA3E and am having problems with the picture from the RGB input. When using the RGB input (input 1) for either Sky or my DVD player there are vertical lines where the colour is slightly out of sync with the rest of the screen e.g. in black backgrounds there the lines are grey and vary in width. They appear in dark scenes or scenes with predominately one colour, most noticeably black although the blue screen in Sky also suffers. I am using RGB scart leads, two different versions tried so far - Cambridge and Monster. Does the TV need replacing or is there some other reason for the lines. There are no lines when I use input 2 (normal scart) for either the DVD player or Sky. In fact the picture is really good! Any help would be appreciated.