Guy bought this unit on ebay, when I power on this unit after the HP logo screen, it goes to a "Notebook hard drive lock password", the seller says he purchased this unit in a "lot" and does not know the password. I tried pressing the ESC key but it does not go to the BIOS, I would like to put a new OS on this unit but since I cannot go to the BIOS to choose the Boot order, what can I do here please?