Ps2 slim won't read Hitman: contracts

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I have a ps2 slim scph-90004 pal (yes I've modded it) and I just adjusted the laser pots (CD-0.655kΩ. DVD 0.755kΩ) and it can read burn out revenge, and gta3 smoothly, although gta3 crashes mid start. But it can't start up hitman. The disk is in great condition, no scratches but it still won't run. Did I do something wrong? Or is the disc just boned?