MBR (Master Boot Record)
Mbr (master boot record) Easy MBR Repair
by old-polack
Grub native install:
From a root terminal on any live CD from any distribution that uses grub; not grub2.
<font color="#FF0000"[root@localhost ~]#</font> grub <Enter>
grub> find /boot/grub/stage2 <Enter>
(hd0,0) <-- Yours will vary depending on where Linux is installed. Use your results for next command.
grub> root (hd0,0) <Enter>
Filesystem type is ext2fs, partition type 0x83
grub> setup (hd0) <Enter>
Checking if "/boot/grub/stage1" exists... yes' Checking if "/boot/grub/stage2" exists... yes Checking if "/boot/grub/e2fs_stage1_5" exists... yes Running "embed /boot/grub/e2fs_stage1_5 (hd0)"... 15 sectors are embedded.
succeeded
Running "install /boot/grub/stage1 (hd0) (hd0)1+15 p (hd0,0)/boot/grub/stage2 /boot/grub/menu.lst"... succeeded
Done.
grub> quit < Enter>
Now reboot your machine and you should now be able to boot from your hard drive as before.