NEC DVD+RW ND-1100A won't read or write CD-R/RW disc

MY NEC drive will only “work” with DVD+R/RWs. It will not recognize
any regular CD either blank or commercially produced (program) discs.
Dell has been no help in resolving this problem. A few of you have also experienced this phenomenon with your DVD+RW drives.
Any suggestions (other than, as I, install an external USB drive)?
Thanks for any help!