My Panasonic Viera 32 Inch Lcd Tv Will Not Play My Ps3 Games I Have A 32 Inch Panasonic Viera LCD Tv And A 40gb Ps3 And Now The Screen Is Always Blurry. .?

I have a 32 inch Panasonic Viera LCD Tv and a 40gb ps3 and now the screen is always blurry. .? - my panasonic viera 32 inch lcd tv will not play my ps3 games

I've never had this problem, but now when I turn on my ps3 the screen is still unclear. The video output is only 480i and I use the standard A / V cables (yellow, red, white). The temperature in my room is now in the 80s, but I do not think that's the problem. How can I solve this problem, and the purchase of an HDMI cable to solve this problem? And, support for an HDMI cable from my TV and PS3?