Hello joandstanton,
Welcome to Community@Insignia™!
If only newer disks are not playing, most provably this will be related to the old firmware not being able to recognize those disks, in which case, you will need to do the update for the unit to start working with them.
First, we will need to find which firmware will be the one needed, as stated on the guide you will need to look for the "E" number on the back part of your player, it should start either with E5E or E5H (if none of the options are the ones listed, then check the model number since we may be looking at an incorrect model).
Download the correct .iso file and you will need to burn the file to a disk, make sure that all the files contained are displayed on the Disk's root (you can either use an image burner, or open the iso and then copying those files). Also try using a low burning speed (4X) to avoid reading problems.
Finally insert the disk and select YES when asked.
If it was useful, and you liked it, Kudo it!
Thank you,
Guille
Insignia™ Support Team
