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When your motherboard does not save settings it may be time to replace the CMOS battery

At some point in time, your motherboard may forget the time and date or the onboard device settings. A Complementary Metal-Oxide-Semiconductor (CMOS) is used on the computer's motherboard to save the system settings (time and date, on-board devices, etc.). It uses an on-board battery to keep it powered when the system is turned off. The standard replacement is a CR2032 lithium battery.

Typical CMOS battery
A generic CR2032 lithium cell

Common indicators that the CMOS battery needs to be replaced

  • You start your computer and almost immediately get a message similar to this: System settings have changed Press F1 to resume, F2 to Setup.
  • You run your computer 24/7, only restarting for maintenance. You notice that the on-board clock is running slow and not keeping the correct time.

Replacing the CMOS battery

  1. With the system turned off, unplug the power cord.
  2. Open the computer case.
  3. Locate the CMOS battery.
    Typical CMOS battery location
  4. Press the battery release lever and the battery will pop up.
    CMOS battery release lever
    CMOS battery released
  5. Replace with a new battery.
  6. Close the computer case and plug it the power cord.

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Phoenix, Arizona 85008
(602) 795-1111

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Geeks in Phoenix is an IT consulting company specializing in all aspects of Computer Repair / PC Repair / Laptop Repair. Since 2008, our expert computer repair technicians have been providing outstanding Computer Repair, Virus Removal, Data Recovery, Photo Manipulation and Website Support.

Geeks in Phoenix have the best computer repair technicians providing computer repair and service in Phoenix, Scottsdale and Tempe Arizona. We offer In-Shop, On-Site and Remote (with stable Internet connection) computer repair service.

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