CD reading problems in DVR16LS

I need some help, maybe someone have the same problem I just bought a Philips DVR16LS and i was only able to burn a DVD and the Lightscribe label, after that, the recorder doesn’t read or burn any CD, It reads and burns Dvd only, I changed the firmware to 1.5, 1.8, 1.9 and I got no good results, no cd, cd-r or cd-rw is recognized, as if it was empty.