Pioneer dvr-111d wont read dvd+r or dual layer



my pioneer dvd writer model dvr-111d has just stopped reading blank dvd+r and dual layer dvd+r it just comes up an cd drive but it will read dvd-r blank and dvd+r,dual+r that has already been burned.i have had the drive since august 06. i have updated the firmware and checked the pin settings and the cable,and tried to update,reinstall the driver but nothing has worked i have been useing memorex dvd’ friend says it may be the brand dvd’s im useing but the memorex dvd+r and the hp dvd+r dl worked before what could make it stop working now.please help!!! thanks