You could try here:
BIOS Master Password Generator for Laptops
Or this application:
Dogbert Blog
The second is probably more likely to work, as long as the serial ends in -2A7B or -595B.
SOURCE: unlock bios dell inspiron 640m
To clear the bios password you will need to contact Dell support for the master pass code. You will first be required to be the registered owner of the machine. If you're not, then follow the first link bellow and register ownership. If you don't know the previous owner, just type in ebay. Then follow the second link for the contact info for the master code.
http://support.dell.com/support/topics/global.aspx/support/change_order/tag_transfer?~ck=ln&c=us&l=en&lnki=0&s=gen
http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&dl=false&l=en&s=gen&docid=E21A18454B4A6550E030A68F27286358&doclang=en&cs=
SOURCE: bios password dell d800
Remove BIOS battery. Short BIOS jumper or leave the battery out for a long time(Over night,maybe) This should default the BIOS to having no pass word present. If that doesn't work then evidently Dell has one within the BIOS . Just ask them.
SOURCE: I need to remove the administrators password for Dell Inspiron B130 service tag ends in 595B
Dell Laptop with bios or hard drive password set ? Unlock your dell laptop using the link below if it display a message that says "this computer system is protected by a password authentication system, you cannot access the data on this computer without the primary or administrator password, when you turn on the computer. This message is what you get if the BIOS is protected by a password. or you get system disabled
Go to: http://dell-inspiron-b130-bios-password.biospwd.com to get your dell bios password authentication and get full access to your dell computer, they can unlock almost all dell laptop such as dell inspiron, xps, latitude, precision, studio, vostro
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