Do you see the password right when you turn on the computer or when it loads the operating system. If its almost immediatley after you turn it on, try to remove the battery and also the CMOS battery. Remove both and leave them out for atleast an hour and then put them both back. If the password isnt gone then your outta luck. Now if the problem is a password in the operating system its a much easier problem.
Hope this helps and good luck fixing!