How to Reset BIOS on Dell Optiplex GX280

Written by david clair
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The Dell Optiplex GX280 is a mini-tower desktop computer with an Intel Pentium 4 processor. The computer's motherboard is equipped with a BIOS utility that provides a user interface for configuring hardware settings. Changing BIOS settings incorrectly can cause performance or system problems. Reset the BIOS to restore all settings to the factory-set defaults.

Skill level:
Moderately Challenging


  1. 1

    Turn off the Dell GX280 computer. Unplug the power cord from the electrical socket.

  2. 2

    Lay the computer down on its side with the back of the computer facing you and the side with the "Dell" logo facing up.

  3. 3

    Press the release button on the bottom of the computer. Pull the side cover up to open it.

  4. 4

    Press the unlock tab next to the CMOS battery, which is a silver dime-sized battery located near the memory modules.

  5. 5

    Remove the CMOS battery from its socket. Leave it out for at least five seconds.

  6. 6

    Put the CMOS battery back into its socket. Press down on the battery to engage the lock tab.

  7. 7

    Replace the side panel. Press the panel into place until it locks into position.

  8. 8

    Set the Dell GX280 computer back onto its base. Plug the power cord back into its socket.

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