Ya sale un error distinto:
HFS+ partition error

En la guia dicen:
If you have an "HFS+ partition error", copy all the files from /usr/standalone/i386 of the Darwin CD to a partition in ntfs,fat,or ext but not hfs on your hard disk, and put this in menu.lst :

title OSX_X86
rootnoverify (hd0,2) <- replace hd0,2 by the partition where you have copied chainloader files.
makeactive
chainloader /chain0

Magnífico, alguien tiene el cd?

En otro sitio dicen

Hit an “HFS+ Partition Error”, but that was corrected by using fdisk to set the
partition type to ‘af’

Así que a eso voy.