Pixel mania on my Panasonic 42G10

[dr strange]

I've got a 42G10, and originally couldn't have been more happier. I set it up, configured it, got my SkyHD box, and the whole thing was beautiful. HD picture was stunning, and my SD picture was pretty darn good too, so was well pleased. On the night England played Croatia I decided to take out the picture feed wire from my HD box and insert it into the back of the tv to see the game in HD via Freesat. Worked perfect, and of course enjoyed the game, and once it finished I replaced the lead back into the box. That's all I did! However, since then I have had pixel problems when viewing in SD. Fuzziness surrounds everyone, sport is a major problem, BBC is almost unwatchable and even my HD picture has slightly suffered. It was all set up the standard way, engineer set up the Sky box, and the only thing I did was swap over lead for 2 hours. Is this an unusual issue? Any ideas how I can get my stunning picture back? Anything I can tweak, or is it all wires out and take the whole thing back to the beginning? WAS I NUTS?

A desperate Dr.