Grub Help winxp screwed

germansailor · 05-15-2007, 09:48 PM

Hi I have windows Xp and fedora core 6...My win xp is not working so i want to reinstall it now...
So xp as it always does will overwrite the MBR....now wat can i do to install grub in mbr again
My grub file looks like this

1 # grub.conf generated by anaconda
2 #
3 # Note that you do not have to rerun grub after making changes to this file
4 # NOTICE: You do not have a /boot partition. This means that
5 # all kernel and initrd paths are relative to /, eg.
6 # root (hd0,10)
7 # kernel /boot/vmlinuz-version ro root=/dev/hda11
8 # initrd /boot/initrd-version.img
9 #boot=/dev/hda
10 default=2
11 timeout=7
12 splashimage=(hd0,10)/boot/grub/splash.xpm.gz
13 hiddenmenu
14 title Fedora Core (2.6.20-1.2944.fc6)
15 root (hd0,10)
16 kernel /boot/vmlinuz-2.6.20-1.2944.fc6 ro root=LABEL=/ rhgb quiet
17 initrd /boot/initrd-2.6.20-1.2944.fc6.img
18 title Fedora Core (2.6.18-1.2798.fc6)
19 root (hd0,10)
20 kernel /boot/vmlinuz-2.6.18-1.2798.fc6 ro root=LABEL=/ rhgb quiet
21 initrd /boot/initrd-2.6.18-1.2798.fc6.img
22 title Windows Xp Sp2
23 rootnoverify (hd0,0)
24 chainloader +1

Please Help
Thanx in advance

Lenard · 05-16-2007, 07:01 AM

Boot from the Installation media into rescue mode; linux rescue
Answer a few questions and follow the on screen message about using chroot
When ready type something like: /sbin/grub-install --recheck /dev/hda

pixellany · 05-16-2007, 07:26 AM

You can make a grub floppy also (not a bad thing to have around).
This might be helpful

archtoad6 · 05-16-2007, 10:01 AM

You could also save a copy of the MBR:

Code:

dd if=/dev/hda of=/boot/mbr.01.dd bs=512 count=1

(Assuming "root (hd0,10)" ==> hda11.)

Then, after XP hoses it:

Code:

mount /dev/hda11 /mnt/hda11
dd if=/mnt/hda11/boot/mbr.01.dd of=/dev/hda bs=512 count=1

Of course, you may have to adjust "if=/mnt/hda11/boot/mbr.01.dd", depending on how you boot to do the restore.

And there is nothing magic about my choice of file name.

Junior Hacker · 05-18-2007, 11:39 PM

I once passed these instructions in another thread, did not get a response. I think the poster preferred to have the Vista boot loader and did not try it. But here are the instructions using the FC6 install disc:

Boot from Fedora Core Linux 1st CD or DVD and type the following commands at shell prompt:

Code:

boot: linux rescue

Just follow on screen instructions, when prompted let installer search Linux installation. If the search operation is successful, your Linux installation will be available at special directory called /mnt/sysimage.
Prepare system for GRUB reinstallation

Code:

# chroot /mnt/sysimage
# cd /boot/grub

Install grub to the drive set to boot in the bios (normally the primary drive), if it is the first drive which is a SATA (SCSI) drive, use this command (replace 'sda' with 'hda' for ATA IDE drive):

Code:

# grub-install /dev/sda

If above command returned any error, return with –recheck option to probe a device map even if it already exists:

Code:

# grub-install --recheck /dev/sda

Exit from chrooted enviroment and reboot Linux:

Code:

# sync;sync;exit;exit
# reboot