Hi, I have a kd36nx200 linked to Sky box and DVD, which has been working fine. But I now have a fault. The Digital TV signal is working fine.... but both the sky box and DVD inputs are now causing the screen to lose the picture -entirely with the Sky input, and the DVD signal is disrupted and dvds will not play without the picture being broken up. Does anyone know if this is a common fault - or if anything can be done by me ... prior to calling in an expensive repairman... ( typically gone wrong outside of 1 year!!) Any help or advice - gratefully received!