When computers does not starts.

When computer does not starts normally or in safe mode you need to reboot it using the sae operating system .This may repair your existing OS known as Recovery Console.

       Follow the solution:

• Insert  the OS (XP) into CD-ROM drive.
• Press the Ctrl+Altr+Delete to reboot.
• The screen display as :

             

Recovery Console Screen

• Press R to start recovery console.
• The recovery console screen displayed above. 
• Now just press the menu number on the keyboard, and you will be prompted to enter the Administrator's password. You'll then find yourself at the main Recovery Console prompt.