few years ago my ps3 slim also facing this prob. I want to play my BFBC2 disc but when I put the game inside I heard weird noise from the drive. some other disc can read but some wont. after a few days all my ps3 disc cannot read and the cause was the lens. I ask nearest gameshop about the cost for replace the lens and most of the quote me arong RM250. I'm a stingy guy so what I do is DIY change the lens. bought it from www.dx.com for RM60+ and got it after 2 weeks. pry open my ps3 and change the lens. it works great after that. now I sold my ps3 already and it still working great according to the buyer. maybe u can try changing the lens first