I think there are a few reasons: 1 Make sure the bought DVD is the same region as the DVD player; 2 the dvd player is too old to support latest DVDs that comes with some newer protections; 3 a defective drive failure problem . Try another disc drive and you may want to take a look at [https://www.winxdvd.com/troubleshoot-dvd/how-to-make-dvd-player-region-free.htm|how to make DVD player region-free]