This is the third time I've run across a DVD in my collection that has acquired some type of problem. Previous times the DVD locked up during a certain scene. This time the DVD is recognized as a DVD, but then the display goes to "insert disc". I've tried to run it on a PS-2 and it doesn't even recognize it (so I know it's not the player). The disc doesn't look scratched. Am I not looking close enough, if not what should I look for? And most important..can I fix it? Any thoughts are greatly appreciated. Thanks.