HELP! I recently purchased a CD player on EBAy. I learned the lingo and got the right model number. I also got great abdvice from someone on the nuts and bolts of the install/ Quite simple really. Just 2 fiber optic cables and a power plug. However, when I hit the cd button on the radio, it just displays "NO CD CHANGER"- Do I need to get the dealer to set a computer code or something? :?