Your blue ray drive is dead
if you have a BC PS3 that will set you back 80USD
if its a slim its 70USD now installation will be 80-120$
I would know since mine died October of last year and buying a 80$ drive and paying 15$ shipping and installing seamed dumb so i researched local game shops and eventually found one and i got it done for 100$ =) make sure you watch tho they sometimes take parts out.. all they should touch is the big grey box * blue ray drive.* if there taking the whole thing apart there doing it wrong*
*EDIT*what seems strange is it just died, mine had symptoms a full 2 months and a half before , kilzone's voices would be of sinc, and the last level would never work , it then got to the point were cars wouldn't pop up in the UCD when i would click them to view them then the music would pop out and after that the game wouldn't load , then it wouldn't get passed the loading screen and then i got to your point, no disk. Mabby it has dust in it?