I also get audio but no video.
I have PowerDVD Ultra HD DVD edition and AnyDVD HD. Vista recognizes my Xbox 360 HD DVD player, but PowerDVD Ultra won't recognize it. I only get the sound.
I'll check other thread about this issue.
I have the exact same problem!
I'm using XP Pro SP2 on an AMD 4800 X2 with 2GB of RAM and an NVidia 8800GTX (with latest drivers from November). I'm using the XBOX HD DVD drive.
I'm running in single-monitor mode, and have tried 2 different HDCP monitors (Dell 2407 and Westinghouse LVM-47W1) over DVI.
First PDVD would crash as soon as it started playing. Then after a week emailing their tech support (in India, of course, and they take 2-3 days for each reply!!), I got a beta version of PDVD that does not crash.
Now I can play an HD DVD (only have one so far - King Kong that came with the drive... not getting more until it's working) in the title screen and for the legal screens, but as soon as the film starts I lose all video and just have audio.
It doesn't matter whether AnyDVD is loaded.
Their crappy BD/HD Advisor software shows a green light for everything but the HD DVD drive, but of course it is present (or how would I be playing even the audio portion of the film?!!). And actually when I run the Advisor on another PC with the same HD DVD drive, it says that is present (but that PC has other issues to make it unusable... much too slow CPU/video card).
Where I'm at now is waiting the last 5 days to hear back from tech support after sending them all the logs and screenshots they asked for. They are just incompetent. They obviously just outsourced everything to India and don't give a crap. I am thinking of having my credit card company cancel the charge, since Cyberlink gives no other recourse (and I'm sure their $20+ phone support would be abolutely useless, and then I'd just be even angrier).
Argh!!!!!!!
Sigh... I only wish Theatertek could get an HD version out before too long.