Replacing your CMOS
- Boot your PC and enter its setup
mode. If you watch your screen closely as it boots, it usually will
tell you how to enter your Setup. Often it's pressing F1.
- Write down all of the settings
from the various menus.
- Power off your PC.
- Open the case and locate the battery
on the motherboard. See your user manual for specifications about the
battery and its location.
- Obtain a replacement battery from
a local or online computer parts dealer.
- Remove the old battery and replace
it with the new one.
- Document the date you replaced
- Replace the case and power on
- Enter your PC's setup mode.
- Reenter the settings you have
written down from the various setup menus.
- Norton Utilities and similar software
suites usually contain utilities that allow you to backup CMOS settings
to a floppy. Use such a utility in place of writing down and reentering
- Don't forget to observe proper
anti-static precautions when operating inside the case of your PC.
- If you can't see your battery
right away, try removing expansion cards or unplugging cables. Most
newer motherboards use lithium batteries that look like large watch
This excellent tip courtesy of CNET