After installing other system on other partition i must re-install grub.
# grub-install hd0
/dev/mapper/pdc_bbcaggibjp2 does not have any corresponding BIOS drive.
Fedora is on /dev/hda2
/dev/hda1 1 124 995998+ 82 Linux swap / Solaris
/dev/hda2 * 125 912 6329610 83 Linux
/dev/hda3 913 2148 9928170 a9 NetBSD
/dev/hda4 2149 9729 60894382+ 5 Extended
/dev/hda5 2149 4017 15012709+ 83 Linux
/dev/hda6 4018 9729 45881605 83 Linux
title Fedora Core (2.6.16-1.2122_FC5)
kernel /boot/vmlinuz-2.6.16-1.2122_FC5 ro nodmraid root=LABEL=/ rhgb quiet
So i don't understand why "grub-install" procedure doesn't work. Before (FC1,2,3,4) i don't have this problems
diagnose this problem is very hard for me, cause googling give me many results on many different problems name as "does not have any corresponding BIOS drive"