Dear friend,
please take the following action to set the grub password:--
[root@server ~]# grub-md5-crypt >> /boot/grub/grub.conf
type the password ## these two entries will be not visible
retype the password
[root@server ~]# vi /boot/grub/grub.conf
hiddenmenu
password --md5 < encryptedpasswd > ## add this line here
title Red Hat Enterprise Linux Server (2.6.18-8.el5)
:wq
Thanks & Regards
Narendra Gupta
narendra.server@gmail.com