I have the same thing happen to my Samsung plasma tv just yesterday. I have a 58 inch. The tv started with a stuck green pixels first and all of a sudden just shut off. When I came closer, I was shock to found out there's a crack, and I was so puzzled how did it happen when no body touched it. Then I realized after I inspected it that its internal. The problem is, my warranty run out, I bought mine 2 yrs ago.