I have a PS2 slim and it reads all my games but 3. I have tried various coloured discs: the blue, silver and black. I have tried both CD and DVD based games. I have tried the 3 games that won't work on another PS2 and they worked. So the 3 games work on another PS2, the PS2 doesn't seem to be ruling out any particular type of disc that I am aware of and I have tried adjusting the DVD laser pot to the recommended range of 950-970R. But it still doesn't want to run. The only form of success I have had is when I changed the disc speed to fast it ran Spy Vs. Spy once, but after turning it off and on again it no longer worked. In case it helps the 3 games that won't run are: Gran Turismo 4, Spy Vs. Spy and Midnight Club 3 DUB edition remix. They are all DVD games and silver. If anyone can help it would be greatly appreciated.