Well first off, make sure the disk if in PS1 OR PS2 format. That is what the PS2 Is requesting when it says "Please insert Playstation or Playstation 2 format disk. The Slim PS2 has various problems reading disk.(Don't Know why? I own it and Know it does). The Fat version(1st version) is a much better system, in my opionion. Try blowing air to clean the disk reader. Or changing the disk reader portion out, At a small price.