GT4 freeze on PS2

I have GT4 on ps2, it works fine, but today i want to play, and it preeze before loading. I was seeing the disk, and with that is not any problem.I try it without Memory Card, too. What I can do? I don't want to buy another GT4 disk. Please Help!
 
is this a fat or slim PS2? if you have a launch console consider yourself lucky that it's still working!

this used to happen on my original PS2 back in the day; i would take the cover off and manually adjust the laser one or two notches to the right or left. sometimes it worked, sometimes it did not. depending on what shape the disk is in it could just be a matter of trying it over and over until it reads the disk.
 
try a different console.( a freinds) if it works on freinds console its your Slim. If It don't work on freinds console its the Disk.
 
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