SNES B&W Problem? I assume what you mean is that the output for your SNES console is black and white instead of color? If that's the case, I recommend you do one of two things:
a) Ensure your rca cables are in the RCA outlets (Red to red, yellow to yellow, white to white)
or
b) Buy new RCA cables as yours just might be defective.
However, I don't know too much about your problem. Mind sharing a bit more information? xD
Well, It seems to decide when it wants to play games in color, I've tested av cables that work just fine on my N64 and GC, but no matter what I do It will mostly in Black and white and sometimes color.