The X-Box only has the three cables. And I meant red, not black, so white, yellow, and red. (Where did I get black from?)
So, I cheated. I used the monitor out, which is the red, blue, and green to the TV, yellow, white, and red. I then from the X-Box I put the white and red cables on the DVD input and then the yellow I put in the blue of the composite DVD input.
Strange, but I have picture and sound.