Triple boot:XP,ubuntu&FC5 grub failed

[NewbieLearnLinux]

I'm facing a similar problem. 

I installed Windoze XP on hdc1, and then Ubuntu on hdd1 (swap is hdd2),
with UbuntuGRUB on MBR (hd0) , I think . then I installed FC4 on hdd5,
with FC-GRUB on first sector of FC's root (hdd5) . 

And when I reboot I can't find how to boot to FC, the Grub menu is
UbuntuGRUB , like before I installed FC4 . And the hdd6 (vfat) , hdd7
(ntfs) is not mounted properly .

Please help,


-- 
NewbieLearnLinux