Hi....for no apparent reason the Matshitta UJ-8400 CD/DVD Driver installed in my Vaio VGN-FS315M laptop has ceased to deliver any DVD sound. No problem with any of the system sounds, games, YouTube, CD etc etc. I've tried everything that Windows XP support suggests, and countless blogs, but I've finally come here for any help available. Hopefully I won't need to search any further.