I recently posted regarding the Xbox 360 HD-DVD player and using it on my Vista laptop, and had issues playing any HD-DVD movies, well it turned out it was WinDVD9, do I installed PowerDVD8 with HD-DVD support which has played all movies perfectly. I recently purchased all 5 Harry Potter HD-DVD movies for around $AU9 each brand new, and for some strange reason PDVD8 plays Year 1 and Year 5 but the other 3 HP movies wont play at all - just a black screen and the status bar (blue) going along as normal - so no picture and no audio. These are brand new discs, however I looked at the HD-DVD discs and they look as if they have an oily slick pattern to the data side - not clear and smooth like other discs - possibly a dud batch? I believe WB dont use region coding either, so this is not the problem. How can I verify these are dodgy discs?