My PS2 would not read CD's DVD'S. It just kept coming up with the infamous "DISC READ ERROR". However I successfully fixed the problem in just over ten minutes just by adjusting the laser. How to fix it Turn it upside down, with the expansion bay close to you. Pop off all the rubber and plastic plugs, remove the screws beneath (there's 10). Remove the top cover (careful, there's a wire set that goes from the top cover to the unit, leave it in place), then the bottom cover (this is where you break the warranty seal, so if your's is less than 90 days old, I don't recommend this). Now replace the top cover (so it's easier to work with) and place the unit upside down, again with the expansion bay facing you. Remove 2 screws, one holds the metal shield in place, the other holds the expansion bay together. There is a ribbon cable between the bay and the unit. Have a friend hold the bay upright, exposing a hole that exposes some of the DVD drive workings. Here it is, the laser adjusting screws. They are 2 silver screw looking things, with a black screw between them. The right silver thing controls the CD, the left controls the DVD. I turned mine 1/8 clockwise turn each. The thing I read said to adjust 1/16 to 1/8 turn and try. I partially re-assembled mine after just 1/8 turn and EUREKA!!!!!!!!!!!!! I cleaned it out a bit and did the final assembly, and now my PS2 works every time. I even put in a CD that was previously a coaster it was so scratched and it read it first try.