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Clearing and resetting the BIOS

The CMOS button resets BIOS settings to default, but does not clear the passwords or aect any of the other

Security settings. On Intel systems with advanced manageability features, the CMOS button will also partially

unprovision AMT.

1. Turn o the computer and any external devices, and disconnect the power cord from the power outlet.

2. Disconnect the keyboard, monitor, and any other external equipment connected to the computer.

WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to

disconnect the power cord from the wall outlet, and allow the internal system components to cool

before touching.

CAUTION: When the computer is plugged in, the power supply always has voltage applied to the

system board even when the unit is turned o. Failure to disconnect the power cord can result in

damage to the system.

Static electricity can damage the electronic components of the computer or optional equipment. Before

beginning these procedures, ensure that you are discharged of static electricity by briey touching a

grounded metal object. See the Safety & Regulatory Information guide for more information.

3. Remove the access panel.

CAUTION: Pushing the CMOS button will reset CMOS values to factory defaults. It is important to back

up the computer CMOS settings before resetting them in case they are needed later. Back up is easily

done through Computer Setup. See Computer Setup (F10) Utility on page 67 for information on backing

up the CMOS settings.

4. Locate, press, and hold the CMOS button in for ve seconds.

NOTE: Make sure you have disconnected the AC power cord from the wall outlet. The CMOS button will

not clear CMOS if the power cord is connected.

NOTE: For assistance locating the CMOS button and other system board components, see the system

board components image at System board on page 63.

5. Replace the access panel.

6. Reconnect the external devices.

7. Plug in the computer and turn on power.

NOTE: You will receive POST error messages after clearing CMOS and rebooting advising you that

conguration changes have occurred. Use Computer Setup to reset any special system setups along with

the date and time.

For instructions on Computer Setup, see Computer Setup (F10) Utility on page 67.

120 Chapter 8 Password security and resetting CMOS

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