Hi, I recently bought a TV series box set. When I insert the disk, after about 2 minutes of it attempting to load, it comes up saying: "You have inserted a blank disk. How would you like to view it?" and sure enough, when I opened Finder, it said the disk was empty. The region on the DVD says Region 1, and I'm 80% sure when I checked my Mac it said it was region free. So is there a way to fix this or have I just bought a set of blank disks?