I may not be able to help you fix the problem, but, my sisters sky stops functioning properly once the video is plugged in, i was told that the video frequency was possibly too close to the sky digi box frequency. It could be possible you are having a similar problem. Before they had sky the video and tv and dvd all worked fine together. It is definitely connected correctly but as soon as the video is switched on you can hear the sky channel but there is no picture. Allegedly you can retune video frequencies but i'm afraid i can't tell you how, that seemed a bit too technical for me . I'm sorry i can't really solve your problem and i hope you don't consider this reply a waste of time. Good luck with it as i know it can be so infuriating.