Reference number: CH000237
CMOS checksum error.
Issue:CMOS checksum error.
Cause:This issue is caused when the CMOS values are incorrect. This
issue can occur because of any of the below possibilities.
- Bad or old CMOS battery.
- BIOS update.
- Disconnecting power from computer
without shutting down computer
Solution:Bad or old CMOS battery
Attempt to reboot
the computer. If error still occurs after rebooting the computer enter CMOS setup and
check all values, this includes verifying the time and date are
correct. Once everything has been verified and/or changed make sure
you save and exit CMOS setup.
If everything appears to be correct and the issue persists try
resetting the CMOS values to the defaults and/or Reset Configuration
Data. Additional information about how to do this can be found on
document CH000976. Note: If this issue continues
to occur after you turn off your computer off it is possible that the
CMOS battery may be failing or already bad. Before considering
replacing the CMOS battery try leaving your computer on for several
days. Additional information about replacing the CMOS battery can be
found on document CH000239.
Computer improperly turned off
If the computer was had the power
disconnected while it was still running it is possible this could
cause the CMOS to become
corrupt. Ensure that the computer is ready to be shut off before
turning off the computer. If you have a laptop computer ensure that
the battery is charged before disconnecting the power
connection. If the
CMOS values have become corrupted entering the values in CMOS
setup and saving and exiting CMOS should resolve your
issues. Additional information about entering the BIOS setup
can be found on document CH000192.
BIOS update recently performed
If you've recently ran a BIOS update on the computer the values
stored in CMOS may have been reset. Enter CMOS setup and re-enter
all the appropriate values. Additional information about entering
the BIOS setup can be found on document
CH000192. If you're unable to enter the BIOS setup or after
running a BIOS update your computer no longer keeps its values the
incorrect BIOS update may have been installed for your computer or
the version downloaded may be corrupt. We suggest trying to update
the BIOS again and/or reverting back to an earlier version.
Additional help and information with BIOS updates can be found on
document CH000236.
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