Solution: kernel rebuild on redhat

Boot system from Linux CD and give linux rescue command on boot screen

Select language to English

Select Keyboard layout to US

Press enter on continue and it will search for linux on hard disk

We don't need networking for this operation so select no

Rescue mode will mount system image under the/mnt/sysimage folder press ok

now change chroot to/mnt/sysimage

mkdir /a        (creat /a dir)

cat /proc/sys/dev/cdrom/info :
CD-ROM information, Id: cdrom.c 3.20 2003/12/17

    drive name:             hdc
    drive speed:            1
    drive # of slots:       1
    Can close tray:         1
    Can open tray:          1
    Can lock tray:          1
    Can change speed:       1
    Can select disk:        0

mount /dev/hdc /a       (so that cdrom is mount to /a)

cd  /a
rpm -ivh kernel-(whatever the kernel version)
 
 
Now reboot the system and remove Linux CD from CDROM



Have fun!!!