CD drive failure analysis

CD-RW CRX160E (Sony) drive in Dell Optiplex GX1150 seems to have failed. Will not read or write CD-R, CD-RW with data or music CD. These CDs play ok in another GX150. Device manager shows drive is working properly. Drivers uninstalled and reinstalled. Using Win XP SP2. Looking for reasons this drive seems to have failed. Tried a variety of troubleshooting. Cables have been reseated. Has anyone with lab experience isoated failure reason to worn parts, electronic, or operator error? Is there a failure trend with this type of drive? Sony and Dell diagostics will not detect CD drive.