How to Remove a BIOS Password from a Dell Latitude C640

Written by jason artman
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How to Remove a BIOS Password from a Dell Latitude C640
(Jupiterimages/Pixland/Getty Images)

The Dell Latitude C640 is a laptop computer marketed toward business users. It is common for businesses to outfit their portable computers with power-on passwords to help prevent sensitive information from getting out if a computer is stolen. If you have been given or have purchased a Latitude C640 with a power-on password, the computer is useless unless you remove the password. You can remove the password by temporarily disconnecting the reserve battery.

Skill level:
Moderately Easy

Things you need

  • Phillips-head screwdriver
  • Flathead screwdriver

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  1. 1

    Shut the Latitude C640 down. Remove the main battery and all cables, and turn the machine over so the bottom faces up.

  2. 2

    Unscrew the Phillips-head screw, holding the hard drive compartment against the bottom of the laptop, and slide the hard drive out of the computer.

  3. 3

    Unscrew the five Phillips-head keyboard screws from the bottom of the Latitude C640. Each screw has an icon of a K within a circle.

  4. 4

    Place a flathead screwdriver into the opening next to the right speaker grille, and pry the plastic strip covering the top part of the Latitude C640 keyboard. Lift the strip off of the computer.

  5. 5

    Place the flathead screwdriver under the blank square between the right-arrow and up-arrow keys. Use the screwdriver to lift the Latitude C640 keyboard out of the computer. Place the keyboard upside-down on the touch pad, leaving the cables connected. Next to the keyboard cable connector, you will see the small white connector for the reserve battery.

  6. 6

    Disconnect the reserve battery. If you are unable to remove the battery with your fingers, you can use a small non-conductive tool to gently lift the connector out of the socket.

  7. 7

    Reconnect the power cable, and turn the Latitude C640 on. The computer starts without asking for a password. Ignore any error messages about a missing boot device. Shut the computer back down, and disconnect the power cable.

  8. 8

    Reconnect the reserve battery.

  9. 9

    Lower the keyboard into its original position, and replace the plastic strip containing the speaker grilles. Close the Latitude C640 screen, and turn the computer over.

  10. 10

    Replace the five keyboard screws.

  11. 11

    Place the hard drive back into its compartment, and replace the locking screw.

  12. 12

    Replace the main battery.

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