Thans for ur comment. Do i need a bootup disk to get the Single User mode? If my filesystem is not corrupted then y should i remount the / partition? If i should, then how? How can i edit the sshd_config file from Single user mode? Is vi command available in Single User Mode? Can we edit the conf file with cat command? The grub boot screen is the splash image which enable us to select the OS, isn't it ? U are asking me to select the OS and press e to edit .. right ?

Can you explain in steps what should i do to get it fixed? Please help me. Thanking you in advance.