I bought a Neo Geo CD system a while back on a hunch that I could fix it- it would occasionally read discs but not always- it got disc errors.
I adjusted the laser strength, which didn't help much. I bought a new laser for it, but it still had the same problem. Assuming maybe I got a bad laser, I got a 3rd one, but same problem.
UPDATE: The unit works perfectly now. I noticed that the disk rubbed against the surrounding tray before, but never thought to check that the spindle was pushed down. Someone forced it down (there is no stop) causing the disc to run too close to the laser. I adjusted it up and it boots games perfectly now.
Main unit in the box (not original styro) with new laser, one controller, power supply, and Samurai Shodown 3 original disk+case.
$150+ shipping from 30907 USA
I also have an extra new laser, tested, for $20 + shipping.
http://rittwage.com/pics/sale/ for pictures...