What happened to my DVD player colour?
The answer you need depends on how the player is connected to the TV. Possibility 1: If you are using a Y/C (S-Video) cable, the “C” (chroma) portion of it may have a broken wire or poor contact at a pin. Possibility 2: If you are using a component (RGB) cable, there may be two bad connections or wires. Possibility 3: If you are using a composite video connection, something that you cannot remedy yourself is wrong with the player or the TV. There are also other potential problems, any of which may require assistance from someone who can do a hands-on investigation of the trouble.