Hey guys i have a simular issue.
cad slots were not working on my old PS2 i had - never did actually, so i got a new card, didn't work.
i've literally just got another ps2 and i'm having the same issue - no memory showing.
so i've tried different memory cards and different PS2 but it's not working. i really want to play my old games again but i can't if i can't save my work.
does anyone have any other ideas? cheers