How to reset the CMOS for a Latitude D630

Updated July 19, 2017

The Dell Latitude D630 laptop computer uses a memory chip, the Complimentary Metal Oxide Semiconductor (CMOS), to store hardware configuration information, such as the power-on password that prevents others from using the computer and accessing sensitive information. A coin-cell battery inside the computer provides a charge to this memory chip when the computer is turned off, allowing it to retain this data. Unfortunately, a password can also prevent you from using the computer, if you forget it. If you have forgotten your power-on password, or made another change to the CMOS that prevents you from using the computer, you can temporarily disconnect the CMOS battery to reset the configuration and regain the use of the Latitude D630.

Shut the Latitude D630 down, disconnect all cables and remove the battery. Open the screen fully.

Locate the indentation on the right side of the plastic bezel between the keyboard and screen. Place a flathead screwdriver into the indentation and lift up carefully to lift the bezel away from the Latitude D630. Once you have lifted the corner of the bezel up, separate it from the computer using your hands, lifting up a portion of the bezel at a time and working from right to left.

Unscrew and remove the three Phillips-head screws on the top part of the keyboard, revealed by removing the plastic bezel.

Slide the Latitude D630 keyboard forward slightly, until you can see the securing tabs below the bottom row of keys. Lift the keyboard up, rotate it toward you and place it on the palm rest of the computer. In the back-left corner of the computer, near the copper heat pipe, you should now be able to see a metal coin-cell battery partially hidden by a plastic cover. Extending from the battery is a wire connecting the battery to the motherboard.

Disconnect the coin-cell battery from the motherboard by pulling up gently on the plastic connector at the end of the wire. Do not pull the wire itself.

Connect the Latitude D630 power cable and turn the computer on. Allow it to continue booting until it reaches the Windows login screen, and then turn it back off. Because the CMOS configuration is now reset, you may also see an error message stating that the "CMOS checksum is bad." Disregard the error message and turn the computer off.

Reconnect the coin-cell battery and place the keyboard back into its original position.

Replace the three Phillips-head screws to secure the Latitude D630 keyboard.

Replace the plastic bezel between the keyboard and screen.

Things You'll Need

  • Flathead screwdriver
  • Phillips-head screwdriver
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About the Author

Jason Artman has been a technical writer since entering the field in 1999 while attending Michigan State University. Artman has published numerous articles for various websites, covering a diverse array of computer-related topics including hardware, software, games and gadgets.