Cmos Battery Problem - Alienware Area-51 m5500 User Manual

CMOS Battery Problem

A message "CMOS Checksum Failure" displays during the
booting process or the time (clock) resets when booting -
Try to reboot the system.
If the message "CMOS Checksum Failure" appears during
the booting procedure even after rebooting, it may indicate failure
of the CMOS battery. If so, you need to replace the battery. This
battery normally lasts two to five years. The battery is of type
CR2032 (3V). You can replace it by yourself. The battery is
located under the system device cover on the bottom of the
notebook. See Chapter 4 for more details.
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chapter 5 troubleshooting