How do I clear the CMOS system or supervisor password on a computer?
If you forget your supervisor or setup password, you cannot operate your computer or change settings in the CMOS until you clear the forgotten password(s). NOTE: The following steps reset all standard settings for a Dell Precision computer. The procedure may be different for other brands and models. Check the manufacturer’s web site for the specific procedure for your computer brand and model. Before proceeding, record all current settings so that you can restore them when you finish this procedure.