Have you checked the settings of the drive in computer to make sure that nothing has changed. You can check online for a driver or firmware upopdate.
You also want to make sure that the correct zone is selected for where you live.
You do need a software program to enable the dvd player to play BD discs so has anything been deleted lately and do you still have the install disc that came with the player , that may contain the software needed to play BD.
Yes I still have the disk but when i tried to install it again it wouldn't let me. And i haven't deleted any software to play the BD. All the Blu Ray Disks do is make a noise in the player and then it eventually quits making the noise. And the Blu Ray disk doesn't show up on the computer.