Hello, I have the same problem as Beriaha with my Marantz CDR 500: the burner does not react, even with brand new unrecorded disks ex-packaging: "NO DISK" or "INSERT DISK" appear every time. The owner's manual doesn't give any solution (thanks for the downloading facility). Can anybody help please? Many thanks in advance, Cheers, Hugh. (hpvvdc@skynet.be)