Hi there friend.I pretty much had the same problem....although I will add though that maybe you won't have to throw it out.
Mine stopped reading dvds of any kind it would just show them as "raw" data,but get this it would still read cd and burn cd and dvds with perfect results.
I'm not as knowledgable as some of the fine folks here are,as to what the problem was.
I tried uninstalling and reinstalling,different cables and reflashing to no avail.
I think I know what happened though,a little while ago my sister brought over a burnt disc that would not play,so I thought I would just make a copy of it and reburn it.....needless to say I think I learned the hard way as it kept stopping at a certain part in the disc with a read error "duhhhhh" so I just kept trying diff. programs with the same result of course,lol.
If it matters I was using liggys firmware rpc1 for over a year with no problems.
I really can't complain though as the wifey allowed me to spend more money on the computer,lol,and picked up a AD 7170a for 40 bucks today.
Anyways I'm sure that was alot of useless info but hey what can I say,hope was of some help.
Thanx to all who post and do all the fimware patches,you do a great job.