Clearing And Resetting The Cmos - HP Compaq 6005 Pro Maintenance And Service Manual

Clearing and Resetting the CMOS

The computer's configuration memory (CMOS) stores information about the computer's configuration.
The CMOS switch resets CMOS but does not clear the power-on and setup passwords.
1. Turn off 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!
sure to disconnect the power cord from the wall outlet, and allow the internal system
components to cool before touching.
CAUTION:
the system board even when the unit 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, ensure that you are discharged of static electricity by briefly
touching a grounded metal object. See the Safety & Regulatory Information guide for more
information.
3. Remove the computer cover or access panel.
CAUTION:
to back up the computer CMOS settings before resetting them in case they are needed later.
Back up is easily done through Computer Setup.
4. Slide the CMOS switch.
NOTE:
switch will not clear CMOS if the power cord is connected.
NOTE:
Illustrated Parts & Service Map (IPSM).
5. Replace the access panel.
6. Reconnect the external devices.
7. Plug in the computer and turn on power.
NOTE:
you that configuration changes have occurred. Use Computer Setup to reset any special system
setups along with the date and time.
138 Appendix G Password Security and Resetting CMOS
To reduce the risk of personal injury from electrical shock and/or hot surfaces, be
When the computer is plugged in, the power supply always has voltage applied to
Sliding the CMOS switch will reset CMOS values to factory defaults. It is important
Make sure you have disconnected the AC power cord from the wall outlet. The CMOS
For assistance locating the CMOS switch and other system board components, see the
You will receive POST error messages after clearing CMOS and rebooting advising