Help needed plz,password not working on hp 2133 notebook
 

Hello all,
I have a hp 2133 notebook running on linux.I was hoping to sell this so reset all the passwords to hpmini,both username and password,i applied this and shutdown.I then went back on and now it says that its an invalid username and password,i have tried all my old usernames and passwords but nothing...and ideas anyone?

follow this link..it describes many ways to reset a root password
http://www.linuxquestions.org/questi...ssword-755262/