My daughter built her computer and included a LG Electronics GCC-4520B COMBINATION CD-REWRITABLE + DVD-ROM DRIVE. Her computer is made up as follows: - Motherboard: GigaByte Ga 7N400L - Processor: Athlon XP 2500 - 333 MHz (bus speed) - Ram: 2 x Platinum 256 Meg DDR, 400MHz - Hard Drive: Maxtor 40 Gig - Video Card: Radeon 9200, 128MB (made by Atlantis) - Sound Card: built-in - OS: Windows XP Pro The problem is that her drive handles all CD functions properly (including reading and writing) but will not read DVD's! Any ideas on what could be wrong? Is it possible to install a combo drive like this incorrectly which would only have the CD functions working? Is there some way to test the unit?