i have just wiped off ubuntu (wose grub was causing the problem) and tried to install FC6 on that partition.
that left me with a totally unbootable system (as fedora is aving graphics problems and wont boot
)
i managed to boot by using knoppix, copieing my menu.ls to a bit of paper (very low tech)
then manually entering the stages at the grub command line
(using fedora's grub)
that has got me booted to suse to write this.
will update progress after a reboot