http://www.google.com/url?sa=t&source=web&cd=4&ved=0CC8QFjAD&url=http%3A%2F%2Fwww.pwcrack.com%2Fsecurity_chips_toshiba.shtml&rct=j&q=Satellite%20%20420CDS%20forget%20password&ei=BMYsTbWzEIH78AaEgLG6CQ&usg=AFQjCNEP_M73mypzpokBo3hTAPgvkXeF-w&cad=rja
It seems it has security chip that can't be bypassed with software.