hi,
i managed to screw up my last successful install with iAtkos dvd, anyway the keyboard didn't work very well, and i really missed the Apple's "welcome" animation !
anyway, i gave the iPC dvd last chance - and it worked! all HDDs are mounted and show in desktop!!! all of them!!!
the thing i did during the installation is selecting under Chipset Drivers - Intel ICHx SATA Drives instead of Intel ICH10 SATA Support!!!! and it worked!
i can't believe i didn't do it before....though i did think of doing so many times....

anyway, iam glad it worked out for me, and i hope this will help to those who have mounting HDD problems.
Good luck!