sniper Modchip doesn't work with GAP-Bios!

[Murks83]

I need help!!!!
I got a PS2 with the Sniper-Modchip and a GAP-Bios onboard.
And here's the problem: My DVD-RIP CDs don't work on it!!!
I've already tried all kind of combinations of resetting my PS2 and using swap-tricks, and that shit doesn't work! I think I'll go crazy!
Can anyone tell me how I'll get my RIPs working? I've spent so much money for that chip, Pleeeeeeeeeeeeeeeeeez help me!