I've searched on some forums again for this problem.
It seems the 680I chipset is not verry compatible with the drivers from osx.
I even tried to re-setup my disk cabinet, putting my dvd-rom at sATA 1, the disk with the parttition where osx have to be installed at sATA 2, etc.
But even that won't work out.
Going to do some more research on the boot flags to use.



Chris