DVD Drive problem.....

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While visiting a friend's office today he asked my advice regarding a problem with his HP 7100 Workstation. He runs Windows XP Professional. The problem revolves around his CD/DVD drive. The hardware manager shows the drive as connected and operating and reading/writing CD-ROMs works fine. However, when a DVD is inserted the drive refuses to even recognize that a disk is inserted ... prompts 'Please insert a disk in drive D:' I ran the HP On line diagnostics they provide for this machine which tests read and write performance only at CD level and no discrepancies come up. HP does not list a replacement driver on their support site. My guess is that there is some additional software required to get the drive to recognize the DVD feature, but I have no idea where to start looking. Have you run into a situation like this before?