You may be trying to use a dvd that's already been formatted or partially filled with files. Your dvd must be unformatted or the system will already think it's used. There are dvd's that can be used again and again. They cost more. I don't even remember what to look for on the container; I've had your issue several times, but now when I'm done with a dvd, I throw it away. If you still have problems, check your cable connections.