Why won't my PS3 play a single game, when the others work fine?

I bought my PS3 about 6 months ago when The Last of Us came out. Played the game. Loved it. Put the game aside to play GTAV, and other PS3 games. Fast forward to this month, and when I put The Last of Us into the PS3… nothing happens. It sounds like it’s spinning the disk, but other than that, nothing happens. I thought maybe it was the disk and bought a new copy of the game… nothing happens.

I have a PS3 library of about 15 games, and all the others work fine. DVDs also play fine. Can someone help me?