hmmmmmm.....if you say the disk isn't scratched, then it can't be the disk. To make sure it's not the disk, clean it using a clean microfiber cloth, and clean it like you would any other disc. Wipe the cloth from the center of the disc outward, never in a spiral motion. DON'T USE LIQUIDS. Also try different games/cds/dvds and see if they work properly,and if they do, then its just the cod5 disk. If not, then its the ps3's fault and u need to get it replaced/fix and do it asap if your still in warranty...