Clearing and resetting the CMOS
This section describes the steps necessary to successfully clear and reset the CMOS. The CMOS of the
computer stores password information and information about the computer configuration.
Using the CMOS button to reset CMOS
To clear CMOS using the Clear CMOS button, use the following procedure:
WARNING! To reduce the risk of personal injury from electrical shock and hot surfaces, 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 has voltage applied to the system board,
even when the computer is powered off. 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, be sure that you are discharged of static electricity by briefly touching a
grounded metal object.
1. Back up your computer CMOS settings run Computer Setup (F10) Utility, and select Main > Replicated
Setup > Back up current settings to USB device.
CAUTION: Pressing the Clear CMOS button resets CMOS values to factory defaults and erases
customized information, including asset numbers and special settings.
2. Shut down the operating system, power off the computer and external devices, and disconnect
peripheral devices.
3. Disconnect the AC power cord from the power outlet.
NOTE: The CMOS button does not clear CMOS if the power cord is connected.
4. Open the workstation.
5. Locate, press, and hold the CMOS button for five seconds.
For assistance locating the CMOS button and other system board components, see the system board
layout in
HP Z840 Workstation system board components on page 18.
6. Close the workstation, reconnect external devices, connect the power cord and power on the
workstation.
7. The system boots to an F1 prompt and displays a message that the date/time has changed and that
system options have changed.
8. Press F1. The system shuts down for three seconds and then powers on again.
9. Use the F10 (Setup) Utility to reset the date and time.
100 Chapter 5 Configuring password security and resetting CMOS
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