Hi, Newbie wants to understand why dvd player cannot launch video dvd. I have been to the apple store genius bar, where the problem has not been solved. It appears to be a software problem, since external HD running OS X 10.6.3 reads disk. I would rather avoid formatting HD drive. Can I selectively reinstall some software, such as DVD Player, from the original 10.6.1 installer disks? I have a Macbook 2.13 GHz, 4 GB RAM, 160 GB HD. Thanks for your help.