Backup troubles?

[Djsazabi]

I have a ps2 with a modchip (unsure what kind, as a shop did it) but it uses the gameshark2 to boot up if that helps? anyways the problem is, Ive have backups of Tekken 4, and F355 challenge, yet neither of them will boot. I tried Clone cd and nero for both, and neither seem to work! what could be the problem? anylinks of an exact tutorial of burn method? (The tekken 4 is a Cdr version...) any thoughts or help would be appreciated. Thank you