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BIOS Passwords
BIOS Passwords are the basic settings on your computer, such as how many and what kind of disk drives you have, which ones are enabled and which are disabled and which ones are used for booting. These settings are held in the CMOS chip on the mother board. A tiny battery keeps this chip always running so that whenever you turn your computer off, it still remembers its instructions.
A common method of entering the BIOS is pressing the Del key at boot up. Other common methods are pressing the keys Ctrl + Alt + Esc or only Ctrl + Esc. Most computers have BIOS which can be configured to ask for a password as soon as the computer is switched on. If the ask password option is enabled, then as soon as the PC is switched on, a dialog box welcomes you and asks for the password. You cannot override this and there is no way of disabling this because to enter the BIOS you need to know the BIOS password. So, what do you do? Disable it by hacking into the BIOS Setup. But there is a catch. To disable the BIOS password, you need to enter the BIOS. But as soon as you enter the BIOS, the BIOS ask for a password.
The method of overriding this password prompt is by some serious hacking. Try to reset the BIOS to its default settings so that it asks for no password at all. Do the following:
First, you have to open the computer and then look for a round lithium battery; it probably looks like a silver coin. So, remove the battery and after 30 seconds or so put it back. Some computers my also require you to reset the jumper, so look for a 3-pin jumper and reset it. For example, on most machines you will find a three-pin device with pins one and two jumpers. If you move the jumper to pins two and three and leave it there for over five seconds, it will reset the CMOS.
When you boot the machine, some BIOS may give an error saying that the BIOS was reset or tampered with, but that is not such a big problem
The BIOS can also be used to over-clock the speed of your computer.

Messing with the CMOS chip and the jumper is more dangerous than editing the system files. So, do everything with utmost caution.

Clearing the CMOS without opening your PC
If you can bring the DOS prompt, you will be able to change the BIOS setting to the default. In DOS there is the debug command which allows us to do. To clear the CMOS do the following:
Go to DOS and type:
DEBUG (Hit Enter)
-0 70 2e (Hit Enter)
-0 71 f f (Hit Enter)
-q (Hit Enter)
exit (Hit Enter)

Restart the computer
It works on most versions of AWARD BIOS.