rrf

just in the last couple of weeks, certain games have not been working on my ps2...

like i put in NHL 2004, and it says disc read error
madden also did this
and some other games do this as well
and the same games work on my roommate's ps2

does anyone know about anything i can do to fix it?
like can i send it in somewhere to get it fixed?...
or am i out of luck

thanks