It could be a faulty or crossed wire cable have you hooked up another flat screen to see if the same thing appears and remembervto leave all settings the same on your surround sound or tuner. if it stays the same on another flat screen then you know its the wiring in your home going to the tv or you dont have the wires from you tv to you tuner from your surround sound hooked up properly. i hope that you get it figured out and fixed. make sure you triy what i had mentioned. good luck