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How to clear CMOS on an ASUS motherboard

If your computer is having hardware problems, such as memory-related or boot errors, or if you have forgotten the BIOS (Basic Input/Output Device) password, you can clear the CMOS (Complementary Metal-Oxide Semiconductor) on the motherboard to reset the settings to factory defaults. You can then enter the BIOS to make needed changes and set boot devices. The CMOS is non-volatile memory that stores the settings for the BIOS. Therefore, if you clear the CMOS, all customised settings are lost and factory defaults restored. Clearing the CMOS on an ASUS motherboard is relatively simple, and you can reset the settings within minutes.

Clear the CMOS

Shut down the computer and power it off. Remove the power cord and other cables. Set the computer on its side with the side-panel access cover facing up.

Remove the retaining screws on the back of the case that secure the side-panel access cover. Remove the cover and set it aside.

Put on the ESD anti-static wrist strap and clip the other end to a metal part of the computer case.

Locate the two solder points on the motherboard labelled "CLRTC". On most ASUS motherboards, the solder points are located near the PCI slots.

Use the flathead screwdriver to short the two solder points. Touch the two solder points with the screwdriver for about ten seconds.

Close up the case and plug in the power cord and other cables. Turn the computer on and press the "Delete" key as soon as you see the initial boot screen. Enter the BIOS and re-enter your user preferences.

Reset the BIOS

Power-off the computer. Disconnect the cables. Remove the retaining screws for the access panel on the back of the computer with the Phillips screwdriver. Slide the panel to the rear and remove it from the case.

Slide the ESD strap over your wrist and clip the other end to a metal part on the computer case.

Locate the "CLRCMOS1" or "CLRBIOS" jumper set on the motherboard. The jumper shorts pins P1 and P2 by default. Jumpers are small plastic caps that cover the short metal pins on the motherboard.

Remove the jumper from pins P1 and P2, then place it on pins P2 and P3. Leave it there for ten seconds. Remove the jumper from pins P1 and P2 and place it back on pins P2 and P3.

Close the computer and plug in all of the cables. Power-on the computer and enter the BIOS set-up utility by pressing the "Delete" key when the computer boots. Re-enter user preferences and restart the computer.

Tip

Always wear an ESD anti-static wrist strap when working inside your PC. Computer motherboards are very sensitive to the electrostatic discharge that can build up in your body. You can pick up an ESD wrist strap at an electronics store for a couple of dollars.

Warning

Only use memory modules tested and approved for your particular model ASUS motherboard. Using modules not compatible with the system board may result in Windows errors and boot failure. Check the ASUS website for information regarding compatible modules for your motherboard.

Things You'll Need

  • Phillips screwdriver
  • Flathead screwdriver
  • ESD anti-static wrist strap
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About the Author

Jeff Grundy has been writing computer-related articles and tutorials since 1995. Since that time, Grundy has written many guides to using various applications that are published on numerous how-to and tutorial sites. Born and raised in South Georgia, Grundy holds a Master of Science degree in mathematics from the Georgia Institute of Technology.