PS2 disc barely spinning read error

I recently bought 3 old used ps2 discs, and all of them get the same error. "The disc could not be read." I am using a ps2 slim. Some games work on my ps2, but all of these dont. The only difference I noticed between the ones that work and the ones that dont, is that when i open the disc drive while the disc is reading, the ones that work are spinning fast, and the ones that dont are barely spinning. Is there a way to fix this? (the discs are pretty scratched, but so are some ones that work)

Update: I put the disc in my pc, and it was able to read it, not sure if that means its my ps2 thats the problem or not.

Solution 1:

First, as Kaizerwolf pointed out in the comments, make sure that the region of the console matches the region of the disc. The PS2 regions are NTSC-U/C (US and Canada), NTSC-J (Japan), NTSC-C (China) and PAL. On the console is on the same sticker as the model, and on the discs is usually under the PlayStation logo.

If the regions match, then you probably have a miscalibrated or burned laser, as you mention that the disc spins just fine. You can try to do stuff like align the laser or change the voltage, but they are advanced tasks that would require a complete disassembly of the console and it would probably be better to just replace them at this point.