Don't clear the CMOS

Don't clear the CMOS of your Notebook, because it will not reset any BIOS-Boot password or BIOS-Setup password! Notebooks have better theft protections like an additional (tiny, hidden) IC-integrated module that contains the password. Some manufacturers store the password on a hidden hard disk sector. So, the only solution is a direct contact to the manufacturer's support, where they proof that you are the legal owner of the notebook. Depending on the manufacturer, you have to send him the serial number of the notebook and you'll get (in many cases free of charge) an individual master password to unlock the notebook. Some other manufacturers even offer only the replacement of the notebook's mainboard - which will be really expensive!