DVD plays only in black and white. Hi I just got a new samsung flat screen TV. My dvd player is

Question

Hi I just got a new samsung flat screen TV. My dvd player is playing only in black and white, the cable tv works fine. Everything works completely fine except that the dvd plays with no color. I checked all the settings I could figure out and can't find anything that is set to black and white or anything. I noticed that the cord going from cable to TV has 3 video plugs (red, blue, and green). My dvd to TV has only the 1 yellow video plug. Could this be the reason?