It's caused by the READY setting in the TV service menu being set to OFF which is the UK reset default.
If you know how to access the service menu simply set it to on and all will be fine.
Be careful in this menu though as you can screw the TV up.
I have this problem:
http://www.youtube.com/watch?v=KngWv4ySgYQ
since one or two month. I have not found any solution. Is it the tv? ps3??
No pb with other hdmi setup. I tried 2 ps3 & severals cables
sorry for my bad english, im from belgium

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic