I have just bought a Sagem freeview box with a gold plated scart lead. Upon connecting the box to the TV as per the manufacturers instructions, all I am getting is a rolling and unstable screen. I have tested the scart lead on other equipment and it is fine. My aerial is also fine My TV has only one scart connection and so has the freeview box. Any advice would be gratefully appreciated as I am at my wits end. Please help!