ProBook 4420s won't read DVDs, probable cause: BIOS upgrade (09-09-201​1 F20). Audio CDs OK.

Hi, everybody.
ProBook 4420s is not recognizing DVD media.  Drive is HP CDDVDW TS-L633N.
Recently ran HP Support Assistant to install most recent updates, and suspect the BIOS upgrade may be the cause.  Now at version 68AHH F.20 09/09/2011.
It's not an operating system issue, for it no longer boots from bootable DVDs either.
Audio CDs are propperly recognized.
Running Windows 7 x64 w/SP1 + latest updates.
If not BIOS, I would suspect a hardware failure affecting the "DVD-related" components of the drive.
Please advice.
Thanks,
Mario

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