My Plasma TV is connected to A panasonic DVD recorder EX83 and for a year has worked perfectly. All of a sudden the recorder would no longer record from the HD ready TV. I discovered that all the channels had dissapeared and so I re-tuned both recorder and TV and all the channels were installed again except the HD channels and the recorder worked OK again. Seeing that the HD channels were not recognised by the TV or the recoder, I retuned both items again and the HD channels appeared again. However one channel which I watch a lot (DAVE channel 19) can not be found. Everytime I try to look at it a message says "invalid channel". Can anyone tell me the difference between a message saying "INVALID CHANNEL" and a message saying "NO SIGNAL" and is there any way I can tune into this station Channel 19> Thanks