DVD movies won't play!

[Prototype]

I have a NEO2.5 installed in a US 30001R and can't play DVD movies. The browser just sits on "reading disc" forever. I can play cd, cd-r, and original dvd games... just no movies. Could the DVD lens pot be slightly out of adjustment? I've taken a look at the two adjustment pots, but I don't know which one's which and I don't want to start turning things. Anyone familiar with this ver board who can tell me which pot to try? One pot has a resistor right next to it and the other doesn't... that's the easiest way I can tell the two apart. I don't have an oscilliscope, but I'm familiar with tuning caps, etc from my pager repair days so I'm not worried about breaking anything... just don't want to make things worse. Thanks...