Using the CMOS Button
To clear CMOS using the Clear CMOS button, use the following procedure:
the power cord from the wall outlet and allow the internal system components to cool before touching.
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.
Shut down the operating system, power off the computer and any external devices, and then
disconnect the computer power cord and external devices from power outlets.
Disconnect the keyboard, monitor, and other external devices that are connected to the computer.
Remove the access panel.
Pressing the Clear CMOS button resets CMOS values to factory defaults and erases customized
information, including asset numbers and special settings.
To back up the CMOS settings, run the Computer Setup (F10) Utility and select Save to
Diskette from the File menu.
Locate, press, and hold the CMOS button for five seconds.
The CMOS button does not clear CMOS if the power cord is connected.
For assistance locating the CMOS button and other system board components, see the system
board layout in the Replacing components section.
Replace the access panel.
Reconnect external devices.
Plug in and power on the computer. The system boots to a F1 prompt and displays a message that
the date/time has changed and that system options have changed.
Press F1. The system shuts down for three seconds and then powers back on.
Use the F10 (Setup) Utility to reset the date and time.
Using the Computer Setup (F10) Utility to Reset CMOS
Access the Computer Setup (F10) Utility menu.
When the Computer Setup message appears in the lower-right corner of the screen, press F10,
and then press
If you do not press
Chapter 8 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
Before pressing the Clear CMOS button, back up your computer CMOS settings.
Verify that the AC power cord is disconnected from the power outlet.
to bypass the title screen, if necessary.
while the message is displayed, the computer must be rebooted to access