If the chip was improperly installed, it may. The only real way to
determine if the mod is causing it is to see if you can disable the
chip (holding power or eject down for 10 seconds on some chips) while
others you can't. If you can find how to disable it, do so and try
again with a game and DVD. If it still don't work or you can't disable
the mod chip, remove the mod. What is funny here is it won't read DVDs.
PS1 games are on regular CDs but DVDs and PS2 Games are on a DVD Format
disc. ALso let me know if you want alternitives to a mod chip for
functions like memory card formatting, and playing "fake" PS2 games
(Downloads, DVD-R copies, etc.) This can be done without a modchip
among other chip features. The only thing you biCAN'T/i/B do is
run home-brew apps. ALso is this an original PS2 (big, etc.) or one of
the new skinny ones and did you install the Mod? Hope this helps, post
again with results. nvic