I have a JVC LT-26C31BJE LCD flat tv hooked up to Sony DAV SA30 DVD player and a Pace Sky DigiBox. The setup has been working fine for a year but in the past week I have been getting intermittant picture problems with the tv. Sound comes from Sky and dvd's but I get no picture ... I have a blank screen. At other times everything works. Can anyone help? What do I have to do to get the picture back?