Yes you are right, yesterday I checked the lilo.conf file in the first partition /dev/sda1, there all the information has been modified, So We changed it as,

prompt
timeout=50
default=TB-Main
boot=/dev/sda
map=/boot/map
install=/boot/boot.b
message=/boot/message
lba32

image=/boot/vmlinuz
label=TB-Main
initrd=/boot/initrd-2.4.28.img
read-only
root=/dev/sda1/ image=/boot/vmlinuz
label=TB-Backup
initrd=/boot/initrd-2.4.28.img
read-only
root=/dev/sda3/

Previously the 'boot' has been set to 'boot=/dev/hdc'

I also checked the 'fstab' and 'mtab' entries

The problem yet not solved, Now I noticed another error message said that,

Kmod:Failed tp exec /sbin/Modprobe -s -k scsi_hostadapter, error=2

Kmod:Failed tp exec /sbin/Modprobe -s -k block-Major-22, error=2

VFS:Cannot open device "801" or 8:01 please append a correct "root=" boot option kernel panic : VFS: Unable to mount root fs on 8:01 Spurious 8259A interrupt : IRQ7