I have a Dell Latitude D400 laptop which has just been converted to Ubuntu from Windows XP but when switching on I receive the message: "THIS COMPUTER SYSTEM #GQ1HV0J-595B IS PROTECTED BY A PASSWORD AUTHENTICATION SYSTEM. YOU CANNOT ACCESS THE DATA ON THIS COMPUTER WITHOUT THE CORRECT PASSWORD. PLEASE TYPE IN THE PRIMARY OR ADMINISTRATOR PASSWORD AND PRESS ENTER."

None of the passwords I use or have used in the past are accepted.


Is there any way of overcoming this problem? Any help or suggestions would be gratefully received.