I have a Lite-On 451S (@832) that I used to seed a Torrent off of for one night from a formatted CD-RW. :/ After that, the drive seems to have stopped reading any and all forms of DVD discs, including DVD-ROM, DVD-R and DVD+RW. The green LED will blink a few times upon insertion, stop, then blink 3-4 times, stop, then blink 3-4 times again, then stop completely.
It will still read CDs just fine, including a scratched CD-ROM, a pristine TY CD-R burned in 2002, and a semi-scratched formatted CD-RW. What's going on? Does it need cleaning?