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Can't Detect a Hardware Device? - Try Resetting BIOS

The BIOS (Basic Input Output System) is special software that runs when the computer first starts. It performs a POST (Power On Self Test) and then initializes many of the computer's hardware devices. The BIOS settings are preserved when the computer is turned off by a small battery on the motherboard.

Like any software, the BIOS can become corrupt. If the BIOS becomes corrupt, a hardware device may not operate properly, or a hardware device may not be detected, or the computer may fail to start. If you suspect the BIOS may be the problem, you can reset it to the factory default settings.

The easiest way to reset the BIOS is to use the BIOS Setup utility. To enter the BIOS Setup utility, press the [F2] key while the computer is starting. The specific key to press may differ for different motherboards. The second most likely key to enter BIOS Setup is [Delete]. Once in the BIOS Setup utility choose the option to Reset BIOS Settings to their factory default settings. Then press the indicated key to Save and Exit Setup.

Location of CMOS battery on GIGABYTE GA-970A-UD3 Motherboard
Location of CMOS battery on
GIGABYTE GA-970A-UD3 Motherboard

Another way to reset the BIOS is to use the "Clear CMOS" jumper on the motherboard. To do this you must open the computer case. Make sure that your computer is turned off and unplugged from the AC outlet.

Caution: When working inside a computer be aware that ESD (Electro Static Discharge) can potentially cause damage. You need to discharge yourself by touching a bare metal part of the chassis or using an anti-static wristband.

Locate the CMOS battery on the motherboard. It looks like a large watch battery. The "Clear CMOS" jumper is usually located near the battery. The jumper connects two pins of a three pin header. Move the jumper to connect the center pin and the unconnected pin on the header. After 10 seconds move the jumper back to its original position.

Yet another way to reset the BIOS is to remove CMOS battery for 10 seconds. Use the clip on the battery holder to release the battery. After 10 seconds, snap the battery back into its socket.

After resetting the BIOS, you may need to use the BIOS Setup utility to make the specific settings required for your computer's hardware.

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• How to Reinstall Windows XP
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• How to Fix Rundll32.exe Errors

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