for the last 3 posts:
read through the thread and be aware that the best way is to contact the dell support first. even if others tell different, they are supportive and they will give you help. you may have to prove ownership or claime it.
other methods would be to buy a password from ebay or any site mentioned in this thread or to use the shorting method which is available for 'older' models only (e.g. d600)
I already contact dell through email, but got deniel email after a month of waiting. I know there used to be a lot of people that unlock bios password for a little fees at this site ( got my dell unlocked for $60) and I remember some people even unlock for cheaper with toshiba, hp etc... laptop. Seem like they've been chased away.
I don't mind giving a small donation for their services.