Why are the pictures showing up as black and white?
Well the wires are hooked up properly with the wires in the correct slot yet the Gamecube is coming up as black and white. Why is this happening?
Just to add to what jayeff said.
First and foremost, try to be as specific as possible so that we can help you with better information.
What cables are you using? What kind of display/TV are you connecting to?
Gamecubes have two different video outputs : RCA (Analog - Yellow, Red, White) & Component (Digital - Green, Blue, Red)
RCA is the most common connector (component cables were not manufactured in as high numbers and thus, aren’t common)
RCA uses a single cable video signal (the yellow one) and two audio inputs for left/right (white, red)
Component cables use a THREE cable video signal (green, blue, red) so all three cables have to plugged in to give correct signal.
TVs with component connections only do not work with RCA connections (to be fair, in the past, a few would allow the green connector on the TV to also be used as yellow for RCA, but that is rare) and vice versa.
EDIT: Didn’t see your response in time. I will leave this here for anyone else that comes across this.