CD ROM IS NOT PLAYING CD'S

I HAVE A DELL XPS M140. IT HAS A DUAL CDROM/DVD-RW. IT WILL NOT PLAY ANY TYPE OF CD BUT WILL PLAY DVDS. I CHECKED THE PROPERTIES AND IT SAYS IT IS WORKING PROPERLY. I TRIED A VIRUS SCAN AND A REGISTERY REPAIR. SO FAR NOTHING. I ALSO TRIED UNISTALLING THE DRIVER AND REINSTALLING. ANY OTHER SUGGESTIONS?

<conf>Windows XP / Internet Explorer 7.0</conf>