How to change GRUB Password along with ROOT Password

Boot the system with Linux media

1. Type Linux rescue and enter
2. Follow the steps and it prompt a message your system has been mounted under /mnt/sysimage
3. Go to the following location
4. cd  /boot/grub
5. vi grub.conf and comment/remove password -----md5---------------
6. :wq
7. Reboot the system.
8. after reboot use root as your username with blank password

 That's It......