for my sins I bought a Mico sofia 02A DVD Player and am having trouble with it giving a "incorrect disk rating" message on some DVDs and not others. It will happily play some 18s such as Matrix, Black Hawk Down but not American Pie, Star Wars etc. I've tried entering the access code given in the manual to change the rating but it won't accept it. Anyone any ideas/suggestions or heard of this before? All discs are originals.