anyone know a solution to my tv projection problem?

My 51h83 toshiba projection hdtv has red, blue, and green horizontal lines going across my screen. Does anyone know how to correct this problem? The sound is fine and when i tap on my tv the pic comes back! But when i turn the tv off, it goes back to the same problem. i must of tapped on it to much! Because now i can't get it back! Please help me!