Contact the previous owner.
Sorry, but we do not provide assistance to bypass system passwords,
as we have no way of verifying the legitimacy of such requests.
If the previous owner cannot be contacted for some reason,
Dell service may(?) be able to help.
I'm locking this thread now, any further threads will be closed, so do not post further requests for help bypassing the password. Bumping your own thread after only 1 minute is also not allowed.