My Tv gets analogue pics OK in colour.. but am restricted to 5 channels .. Also have Sky HD .digital .. All been ok till couldn't change Sky channel with remote , Changed remote batteries , Still no joy so switched Sky box and Tv off at mains socket , Could not get Sky at all then ,, box green light was on ,, Since can get analogue in colour and Sky digital ( all channels ) in black and white only ,, any ideas ?