TO REMOVE SUPERVISOR PASSWORD ON DELL STUDIO 1737 LAPTOP:
I have a Dell Studio 1737 Laptop with a Supervisor Password on the BIOS. It has been there for a long time and I just now finally removed it. As usual on these Dell Laptops, there is an EEPROM that stores the password information, so simply removing the CMOS Battery will not remove the password. The BIOS turns out to be a Phoenix BIOS. I have found a script that will generate the master password unlock codes for it. Follow the link to "Phoenix (Generic)" for this laptop.
(or if your laptop has the suffixes -595B,-D35B,-2A7B after the service tag, follow the "Dell" instructions.
It involves entering an the incorrect supervisor password 3 times, a message box pops up listing "System Disabled: 12345 (this code (a hash) is used to generate the master unlock code)" Don't worry - the system won't be disabled. Just push the power button on/off and try again. Enter this code into the provided binary program(on windows) Or python script (on linux) - and now try to power off/on and unlock the laptop with the code that it generated from the System Disabled Hash Code. (all credit goes to dogber1)