Modding Woes

[Cyber Akuma]

Hmmm........ its weird, heres the deal:

Its a USA NTSC system:

The Legend of Dragoon USA (original) - Boots
Tomba 2 USA (copied) - Dosent boot (I was able to patch it though)
DDR 2 JAP ORIGINAL import - Dosent boot
DDR 2 JAP Backup - Dosent Boot

Basically the ONLY ant-stealth games itll boot are original USA games, copied games dont seem to work. and ANY import, original or copied, dosent seem to work. I tried using a GS code I found for gameshark to get past it, dosent work. When I tried it on my friend's psx (he has a mod chip but NOT a tealth mod) DDR2 only booted with the GS code. It dosent boot on mine no matter what though.