Clearing And Resetting The Cmos; Using The Cmos Button To Reset Cmos - HP Z1 Maintenance And Service Manual

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!
the power cord from the wall outlet and allow the internal system components to cool before touching.
CAUTION:
board, even when the computer is turned 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 with Computer Setup (F10) Utility, and select File > Save
to Disk.
CAUTION:
erases customized information, including asset numbers and special settings.
2. Shut down the operating system, turn off the computer and external devices, and disconnect any
external devices.
3. Disconnect the AC power cord from the computer and wait 30 seconds for the power to
dissipate.
NOTE:
computer.
4. Open the workstation.
5. Locate and press the CMOS button.
For assistance locating the CMOS button and other system board components, see the system
board layout in
6. Close the workstation, reconnect external devices, connect the power cord to the workstation,
and then turn 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 restarts.
9. Use Computer Setup (F10) Utility to reset the date and time.
92 Chapter 5 Configuring password security and resetting CMOS
To reduce the risk of personal injury from electrical shock and hot surfaces, disconnect
When the computer is plugged in, the power supply has voltage applied to the system
Pressing the Clear CMOS button resets CMOS values to factory defaults and
The Clear CMOS button does not clear CMOS if the AC power cord is connected to the
System board components on page 6.