ameratsu on 29 July 2009
Many times when the laser is failing the PS2 won't read DVDs or DVD based games but will read CD based games, like early PS2 (purple bottom) or PSX games.
Unless you've used it pretty heavily, the laser lens should just need a good cleaning. Get a container of isopropyl alcohol and some cotton swabs. Swab it GENTLY and leave it dry, then try again. Don't try anything until you have those two things on hand.
If that doesn't do anything, you will need a new laser lens.
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