Hmm.... I have horizontal(sp?) stripes or colors on part of my screen when I am booting up the X environment. Can you use your GUI(KDE, Gnome, others?) If not then it may just be a problem with how the card was set up on your system. Do you dual boot? You could always try a .avi or .mpg in Windows to see if it works. Then you could be sure it was either a card problem or software problem in linux.
Sorry I can't help much but all I can really do is cd through directories
But we all gotta start somewhere dont we?