Regarding the PlayStation, the only two reasons I can think of for you getting an entirely black and white image is that either the RT2X is in the wrong mode, like BuckoA51 suggested (luma is black and white, so selecting composite only pays attention to that) or the chroma line on your S-Video cable is broken.
Are you using a power supply that came with the RT2X, or something else? And have you tried a different HDMI cable?
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