laser or modchip?
 

i have a modded ps2 w/magic 2 and it doesnt read ps1 backups or originals at first it read both, then just originals now niether

thx

sounds like laser try to adjust.

how do i adjust the laser

http://www.ps2.nu/playstation-2-lase...cilloscope.asp


of course clean laser first before you adjust a dirty laser can cause reading issues as well.