Juust had my box installed about an hour ago, now wished i hadn't. The picture on normal tv is absolutely shocking.
Not sure what to do now. i think a call to sky is now the answer this is terrible.
if you go into video settings and change the settings:
Home> help & settings> settings> video output format... I changed mine to all checked except 720p and 576 p (was on Auto)
see if that makes the picture better.. mine is great