I have a Philips plasma 42 with black lines across the screen

I have a Philips plasma 42'' TV (Model#42PF9630A/37) which worked perfectly fine when I turned it off one night and when I turned it on the next day, the picture was all dostorted with hundreds of black lines going across the screen and bizarre groupings of what looks like confetti in all different colors swirling around in various ever changing shapes all over the screen. I've tried unplugging the set, turning off the ambient lighting, and a host menu options to reset or adjust the picture and such. All with no change to the problem. I'm sorry the description is so vague, but it is very difficult to describe. Please advise.