system password

If this is a desktop, you should be able to reset the CMOS memory.

Check the manual for the motherboard / system.

Usually, you set the clear jumper,
power up,
shut down,
reset the jumper to normal.

For a laptop, it depends on the level of the password, and the manufacture.
For most, you need to take the laptop in to a service center (with proof of ownership) and have them reset the memory.

Chas

If you lose your password, you will have to erase your CMOS memory or use one of the default passwords available.
Some systems allow you to choose when the password is needed to change the CMOS settings, to boot the machine, etc.

For an AMI Bios you can disable or find out the bios password using AMIsetup (a shareware utility) Download from here:

For AWARD BIOS you can use the crack file Download from here:

You could try various backdoor default passwords.
(THESE ARE CASE SENSITIVE).

AWARD :

djonet

AWARD_SW

AWARD?SW

lkwpeter

aLLY

589589

j262

Other Bios

biostar

biosstar

LKWPETER

BIOSTAR

j262

j256

Syxz

Wodj

Ami

Oder
A.M.I.
AMI_SW
AMI?SW

Or crack it with debug

Enter debug at the command prompt (You must have debug.exe on your system.)
After this enter the debug commands as follows.

O70,1E
O71,FF
O70,1F
O71,FF

Or check to see if there is a jumper setting on your board.
Some computers are designed to be un-crackable.

For a much more detailed chip level password page click here
(at your own risk.)