The PS2 has a dual laser diode, one for DVD format, and one for CD format. Both use the same optics to focus on the media. Since you can get one disc to owrk and another will not, the issue is with the discs or one of the laser diodes. Determine is the discs that work are CD or DVD format. If the ones that work are all CD format, you need a new laser. Or vice versa, if all the ones that work are DVD format, you need a new laser. If it is mixed, you need to clean the optics or disc media surface.
Cleaning the laser lens is done by getting a Toothpick, and wrapping a small piece of paper towel around the point of the toothpick. Dampen the toothpick swab with a Windex type cleaner, and swab the lens. Use a dry toothpick paper towel swab to dry the lens.
The discs can be cleaned with a toothpaste that is not gritty. Dab toothpaste and add water, then use circular motions to clean up smufges and fine scratches. Rinse and dry with a lint free cloth.
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is you need to get a laser replaced.