Operating System Not found Linux Hard Disk Problem

Scenario : When I boot the Linux Operating System, I got the Following Error message - Operating System Not Found.
1) I have the two hard disk, /dev/sda and /dev/sdb.
2) When Both Hard disks are present it is booting Perfectly.
a) When I remove the Second Hard disk /dev/sdb I got " Operating system not found"
b) When I remove the First Hard disk I got "Grub"

Reason:

1) Booting files /boot/grub/grub.conf are located in /dev/sda
2) MBR Grub is located in /dev/sdb
Some Other criteria
1) Hard disk does not contain the any Operating System,
Due to this only we got the following Error Message.
Operating System Not Found -Error Message

Solution

To resolve this problem First we have to change the grub MBR into First hard Disk.
1) First I boot From Linux CD the Rescue mode.
2) Rescue Mode mount Hard disk File system under /mnt/sysimage
Try the following command to resolve
#chroot /mnt/sysimage
#grub
grub>find /boot/grub/stage1
If File you Got "Error 15: File not found" then try
grub>find /grub/stage1
Then You will get like (hd0,0) or (hd0,4)
grub>root(hd0,0)
grub>setup(hd0,0)
It will install grub Boot loader in (hd0,0)
Then restart the server your system will be booting perfectly. Operating System not found. Grub Error-How to Resolve.