How to Reset CMOS on a Sony Vaio Desktop

Written by robert bayly
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How to Reset CMOS on a Sony Vaio Desktop
Reset the CMOS in a Sony Vaio desktop (motherboard image by Falk from

Sony's Vaio desktop uses a BIOS (Basic Input Output System) that tells the various hardware components how to work together. The CMOS (Complementary Metal-Oxide-Semiconductor) settings are the data specific to the individual hardware components, such as RAM speed, amount of ram, hard drive capacity, voltage settings and other components. The BIOS is permanently stored on a chip. The CMOS settings however, are volatile. They need a constant supply of power to stay in the system. The CMOS settings are maintained with a small backup battery mounted on the motherboard. Sometimes it is necessary to reset the CMOS settings to the default configuration. This can be due to a bad battery, or changes made to the settings that cause the system to become unstable. This usually happens when an attempt has been made to overclock the computer.

Skill level:

Things you need

  • Jeweller's screwdriver set

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  1. 1

    Turn off the Vaio. Remove the power plug from the power supply.

  2. 2

    Remove the left-hand side cover (looking at the front of the Vaio). You may need to remove some small Phillips-head screws on the rear edge of the cover. Slide the cover back and out.

  3. 3

    Lay the Vaio on its side so you can look down into the case. Find the CMOS battery on the motherboard. It is a round silver disc, a little smaller than a quarter. It fits into a round plastic holder and is retained with a small metal clip.

  4. 4

    Carefully, use a screwdriver to push the metal clip to the side and remove the battery. Wait about thirty seconds and replace it. Replace the side cover, plug in the power cord and turn the Vaio on. Your CMOS settings are reset.

Tips and warnings

  • If your CMOS battery is a few years old, you may as well replace it. The battery number is stamped on it. The usual sizes are 2032 and 2025.
  • Be careful not to scratch the motherboard with the screwdriver when removing the battery.

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