3. Remove the access panel.
CAUTION: Pushing the CMOS button will reset CMOS values to factory defaults. It is important
to back up the computer CMOS settings before resetting them in case they are needed later.
Back up is easily done through Computer Setup. See
Computer Setup (F10) Utility on page 113
for information on backing up the CMOS settings.
4. Locate, press, and hold the CMOS button in for five seconds.
NOTE: Make sure you have disconnected the AC power cord from the wall outlet. The CMOS
button will not clear CMOS if the power cord is connected.
NOTE: For assistance locating the CMOS button and other system board components, see the
system board components image at
System board on page 108.
5. Replace the access panel.
6. Reconnect the external devices.
7. Plug in the computer and turn on power.
NOTE: You will receive POST error messages after clearing CMOS and rebooting advising
you that configuration changes have occurred. Use Computer Setup to reset any special system
setups along with the date and time.
For instructions on Computer Setup, see Computer Setup (F10) Utility on page 113.
Clearing and resetting the CMOS 169
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