Probably still a few pennies left lol.
In all seriousness, though, there is always the chance that there is more debris in there if a whole quarter made its way in there. The quarter might have also caused physical damage to the moving parts of your Playstation.
It's a pretty common PS3 issue for laser lenses to go bad as well, which would be characterized by the blue light on the front turning red when the machine tries to read a disc. Unfortunately, locating a replacement lens that isn't just a factory reject is a difficult task if you're not going directly through Sony.