How to Reset GRUB Password in Linux

Here are the steps of changing / rest grub password even after loading the OS

(1) # grub
 grub> passwd: **********
 grub> Encripted: $1$CxcdNVbcfsgUEFd0

Now copy the password-hash ie Encrypted value

(2) Edit grub.conf file and paste the password-hash

# vi /etc/grub.conf

passwd --md5 $1$CxcdNVbcfsgUEFd0

(3) Now save the file and restart the system.

How To Install RHEL on SATA HDD

During the installation of Linux (RHEL) on a SATA HDD, it can give PCI Probing Error and/or disk error.

Two changes must be done before loading the RHEL on a SATA disk.

(1) In BIOS:

In advance option change SATA as IDE

(2) Insert CD-1 and type the following line on boot: prompt-

boot: linux pci=nommconf
or
boot: linux all-generic-ide noapic nolapic
or
boot: linux all-generic-ide
or
boot: linux nommconf all-generic-ide
or
boot: apm=off acpi=off

Now you can load RHEL-5 on your SATA HDD.