Appreciate the linkage, Prime. Thanks.
U.N. Owen - sometimes movie files require certain audio and video codecs to play properly. I usually encounter this with divx and mpeg files, but mov's may respond the same. If updating Quicktime doesn't work, try searching for something called a Nimo Codec. You should find it pretty easily and installing it will take care of your audio/video problems for virtually all files in all formats for good.