Two things to do:
remove your CMOS battery and insert it back after 10-15 min.
there will be a jumper with BIOS CONFIG written near it near the CMOS battery. remove it from position 1&2 and put it in position 2&3.
Switch on your computer and leave it for a few minutes. Adjust settings to your desire.
Put it back in original position.
Restart and you are good to go back into BIOS and make the settings you want.
Take the battery out of the motherboard. Wait a few minutes and put it back in.
SOURCE: how can i unlock dell latitude d420 bios password
Clearing the CMOS will reset the password...
Take the button cell battery out for a few minutes, put it back in, and all settings, including the password, should go back to defaults.
Unfortunately it looks like your BIOS battery is under the keyboard...
Dell has got what looks like decent directions here, for getting at it:
http://support.dell.com/support/edocs/systems/latd420/en/SM_EN/coinbatt.htm#wp1123951
SOURCE: i bought a dell inspiron 1525 notebook and it has a bios password
Take the battery out Short the battery terminals or shorting points .Reinstal battery and the pass word wil be gone.
SOURCE: BIOS PASSWORD UNLOCK OR FALASHER BIOS
if you do not have the bios password you have to open it ..and clear bios by short the pins if you find them...or remove the bios battery for 10 seconds..and will be on factory optimal defolts
SOURCE: DELL XPS M140 MXC051 LAPTOP BIOS PASSWORD
Most laptop or notebook computers feature enhanced BIOS security, and
BIOS passwords on laptops are hard to bypass. Several companies offer
laptop security chip services that can be used to bypass the BIOS
password on Dell laptops or notebooks and reset the security. They can
provide a master password from the Dell Service Tag of your Dell
laptop. This master password will allow you to bypass the existing
password and enter the BIOS and reset the unknown password. To generate
the master password they need to know the Dell Service Tag of your
unit. Dell Master Password Recovery does not require soldering or
disassembly of the laptop and supports most Dell models.
Dell
BIOS passwords can also be reset by replacing the laptop security chip.
Passwords can also be recovered from security chips that have been
removed from laptop or notebook systems. These passwords may be
required to attempt to unlock protected hard disks. Passwords recovered
from these chips are the original BIOS passwords and may be the same as
the hard disk password, but are not guaranteed to be the same and may
not unlock the hard disk.These are usually damaged in the process of
recovering the passwords and are not suitable for replacement into a
computer.
SOURCE: bios password on my dell xps m140
go to www.biospro.com they can help, works for me every time
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