My daughters plasma, now when you turn it on, only has sound and no picture whatsoever, no matter what input you are on. There is no pic, no graphic display, no nada. Maybe a hint as to what is defective, before we lost pic completely, we had a very annoying problem when we would turn off tv it would act as if it was going to turn off, and then turn back on, then we could never turn off with switch on front or remote, she was unplugging it to turn it off. any ideas??