I dont know much about iAtkos but detailing what options you chose could help. Also a full copy of verbose log could be helpful too. You should be able to read the HFS partition from fedora, OS X logs are stored in /private/var/log.
You should not need any boot arguments if you installed a disabler, the busratio options are normally used for AMD or i7 CPUs not Core 2 Duo.
If you have the onboard video active you may need to disable it as OS X doesnt support it.
You could also do a reinstall with the basic options to get os to boot, if you are installing from SATA to SATA in AHCI mode you dont even need to install any applenforceata, and of course as few kexts as posible, just dsmos, disabler, openhaltrestart and ps2 if needed should do.

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AsRock P45TS | C2D E8200 | GeForce 8600GTS
Mac OS X Snow Leopard 10.6.1 + Windows 7 Ultimate 6.1.7600 + Fedora 11