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You probably have the AV cable set to the wrong setting.
^^ i'd agree. there is a little switch on the bottom of the cable, the part that connects to the 360, try switching that around and see what happens.
The AV cable I have is a set with all the systems. There's nothing on it with a switch of any sort.
Well, maybe you should try using the one the 360 came with to make sure it's not the cable.