need help with doing a dvd backup

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Could you please help me? I have a ps2 with usb-mod, a dvd writer (LG), dvd - R and alcohol 120%. I wanted to make a backup of the new game Mission impossible. But when i make the backup with alcohol, and i replace the action replay 2 disc with my backup, my ps2 doesn´t recognice my dvd. Is there something i must know using alcohol 120%??? I just made a normal copy. Or could it be, that i can´t use my usb mod for new games?? But it still works nice with any ripped game on a normal CDR. What could it be i make wrong, doing a DVD backup?? It would be very nice, if here is anyone, who could help me.... please....