problems with SCART socket

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Hi,
I have an Orion (phillips) TV. I was watching a DVD earlier today, everything worked fine. I turned off the DVD and TV as normal. When I went back to it, it now only plays DVD's in black and white. If I swap the scart lead to the other socket (which is normally used for my satelite reciever) it plays fine. I have tried a couple of other things (VCR's) and they all display in black and white when they are connected via the 2nd scart socket.

I have tried changing scart leads, and checked for dry solder joints and any obvious signs of failure. Still it only shows B&W.

Anyone have an idea what may be the problem?

I'd be grateful for any suggestions.