Re-install GRUB progress

1- Boot your system in rescue mode. When prompted to mount the file system, select continue.

2- Chang root file system :
 # chroot /mnt/sysimage

3- Find out your device name :
 # df -h

4- Re-install GRUB :
 # grub-install /dev/hda

5- reboot
 # exit (exit chroot)
 # exit (reboot)