Anyone know what would cause the DVD player (Phillips) and the PS2 to all of a sudden decide to no longer play burned dvds? All I get is a "can't read disk" error on both.

They both worked just fine a week ago, I haven't changed my burn method or the media, but the recent disks I've burned won't play on either of them. The only thing that will play them is the DVD drive on the computer. They are also being selective about which (previously burned) movies they will play now as well, where as before the movies worked fine in both. Any ideas? Non-burned movies are playing fine.