help out a newbie

[sm83]

i made a copy of megaman8 but when i go to play it on my psx it doesn't work. after the sony start up screen the screen stays black.
i have a mod chip and am using clonecd. this has happened to some of my other games aswell when i copy them they jus don't work and as for the rest they work fine.
does anyone know what the problem is, if so let me know. thanks for ur help