Ive finally connected everything up in what i beleive to be the correct way. Ive taken the supplied cartridge out of slot 1 and put a HDMI cartridge in, also adding a HDMI cartridge to slot 2. Panel to Sky+ via HDMI cable, panel to SCHT855 via HDMI cable and Sky+ to SCHT855 via an optical cable. Picture works fine, although this was set up by the Sky engineer, before i had my surround sound connected, but no sound. Where am i going wrong, or what am i not pressing?? Complete novice - please help!!