So I built myself my first HTPC recently and spent a lot of time configuring it with Windows Vista Ultimate, a tv tuner and onboard HDMI video/audio output to my a/v receiver.

I have found that MANY blu-ray discs are not being read by my BDROM, the model is LG CH08LS10. I have tried roughly 20 in total, some rented, purchased, and some borrowed from a friend. When they work it's fantastic, but I find it extremely frustrating that so many disks are not working. I have upgraded the firmware from LG's website and it made no difference. I am using the latest build of PowerDVD 9 Ultra to play the blurays. In case it matters, here are some of the discs I can think of that are not working. Most of them will read and start running, but get stuck at some point while watching and won't go any further:

Sunrise
Short Circuit
The Princess Bride
The Ultimate Avengers Collection
Robocop (windows does not even detect this disc is inserted)
The Fountain (windows also does not detect this inserted)

The fact that it reads part of the movie makes it sound like the disc is bad, but I have a hard time believing I have such horrible luck to be finding around 10 bad discs out of 20 I've tried, what are the odds of that from different sources??

Ones that have worked fine for me:
300
Apocalypto
Star Trek 2 wrath of khan
Appleseed Ex Machina
Year One
X-Men Origins Wolverine

I'd appreciate your input. unfortunately it took a bit of time to find out this was such a serious problem so I can't return the drive for a refund to the store where I bought it, and am considering doing an RMA with LG at this point. These problems are not erratic, they are consistent when tested days apart with the same discs.