You want to see something that is hard to come by? Look up the Mad Catz Rock Band 4 legacy adapter sometime. These used to sell for about $30 or $60 when RB4 came out a few years ago, and now they're hard to come by and sell for about $300 to $500. It's crazy. I am glad I got mine when I did.
I picked up a non-working PS2 at the convention i volunteered at for $30. It needs a new disc drive, but it came with 5 games, a controller and even has the networking adapter, which is worth $30 by itself.
I got it home and played with it a bit. It indeed does not read CDs or DVDs, even after I cleaned the laser lens with isopropyl alcohol. The next step was to attempt to adjust the potentiometers that control the intensity of the laser. With these older systems, adjusting the "pot" on the laser can sometimes help with reading issues but shortens the life of the laser.
That did not work either. I have another PS2 that does work and my train of thought was to pull the laser from the working system to measure the values of the pot so I could adjust the other laser to match, but it turns out my working system has a completely different laser in it.
Early PS2 models used a KHS-400B laser, those can be replaced with another 400B or upgraded to a 400C which is more reliable, and those were generally used on newer phat PS2s anyway.
You cannot replace a 400C laser with a 400B, so I have to replace it with another 400C. My other system uses a KHS-400R, which is a completly different laser and I can't find much information about it. But I can't use that in my 400C system either.
Well, you can, but it requires a homebrew program to mess with the EEPROM of the system to update what the system thinks it should have. I'm not dealing with that nonsense.
I disassembled and reassembled both systems only to find my previously working system no longer working. The red standby light no longer was there, and it did not turn green when i pushed the standby button. The blue light for ejecting the disc did not work either, but both buttons worked as intended and the system booted.
It would not read discs. I don't know what I did. I left it alone for about an hour and then came back to it. I reseated the laser on the rails and made sure the ribbon cable was secured and all the way in, and then made sure the disc tray was aligned properly, as it's a pain to get on and off. When i put everything back together, it magically started working again. standby and eject lights returned and it read a disc.
So now i just await the new laser for the other system and hopefully that fixes it.