sorry this is not an answer but I too have error "wrong disc" and I have the user manual and there is not any reference to "wrong disc" in the troubleshooting section or on any other pages.It plays CDs okay but not DVDs. And I have been through all the Setup menu so many times over with no changes,  so its to the Web were I had hoped to find an answer. Fingers crossed. regards JD.   PS. the machine has previously worked fine on the dvds I am trying now!!!
                 JD.
                
 February 2009