Hey People, yesterday I played Mafia II for the 10th (orso) time, and today i wanted to start it as usual, but it wont start! I reset the disc and PS3, but doesnt work.. What should I do?

I cant load chapters either.. I dont really want to start from scratch because my playtime is about 8 hours atm...

EDIT! I could load chapter 11 ( i were on chapter 13)

So i hope it works again!