Simply boot the server through 1st CD and once all settings complete on installing SCREEN type ‘rescue’ for go to rescue mode
Once server in rescue mode
server[~]#mount /chroot/sysimage and press Enter.
Now check filesystem or grub, if it is related to grub then type to see the partition type.
server[~]#fdisk -l
After checking file system install grub by using following command
server[~]#grub-install /dev/hda,b,c or what ever you are having in your file system.
Hope it will help….if you have any problem contact your data center engineers.
