Ps3 slim wont play games?!

So my Ps3 slim wont play any Ps3 games at all. I've made sure all the discs are clean, and they are. I insert the games in the system correctly. I even just logged into PSN and downloaded the update, but it still wont read the Ps3 games. I dont know whats wrong. Whats weird is that I tested everything else; it'll play PS1 games, DVDs, and even CDs. I really dont know whats wrong. I need some help!!

Sounds like your bluray drive or lens is dead. Try a bluray movie, if that doesn't work it's def the bluray drive since all other forms work because the slim has 2 seperate lenses...you might be able to just replace the lens, or even clean it.