The below steps can be used to fix un-bootable SUSE Linux OS due to Grub corruption or any damage to GRUB boot loader.
Boot to the SLED or SLES 11 DVD (the SP1 DVD is also fine), select "Rescue System" and login as root. At the command line enter "grub" and follow this example:
linux:~ # grub
GNU GRUB version 0.97 (640K lower / 3072K upper memory)
[ Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists the possible
completions of a device/filename. ]
grub> find /boot/grub/stage1
grub> root (hd0,0)
Filesystem type is reiserfs, partition type 0xfd
grub> setup (hd0)
Checking if "/boot/grub/stage1" exists... yes
Checking if "/boot/grub/stage2" exists... yes
Checking if "/boot/grub/reiserfs_stage1_5" exists... yes
Running "embed /boot/grub/reiserfs_stage1_5 (hd0)"... 18 sectors are embedded.
Running "install /boot/grub/stage1 (hd0) (hd0)1+18 p (hd0,0)/boot/grub/stage2 /boot/
In this example the root partition is (hd0,0) as returned by the "find /boot/grub/stage1" command. Use the correct root partition for your system as indicated by this command for the two commands that follow the first one.
Reboot the system and GRUB should come up appropriately.
This Doc is for SUSE Linux Enterprise Server 11 or SUSE Linux Enterprise Desktop 11 but it should work for all SLES and OpenSUSE editons with little and obvious modifications.
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