I have tried many options, but so far none was the solution.
I booted the PC using Ubuntu LiveCD.
Then in terminal, i ran the command:
sudo fdisk -l
It showed all the disk details. Then i ran this command:
sudo fsck -y/dev/sda1
The output was:
fsck from util-linux-ng 2.17.2
Then i restarted the system again, and the message prompted was: "no init found. Try passing init = bootarg" (initramfs):
Please help me out i have important data in this system.