Troubleshooting The Nvram Backup Battery - Dell PowerEdge M420 Owner's Manual

Troubleshooting The NVRAM Backup Battery

CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by your
warranty. Read and follow the safety instructions that came with the product.
The battery maintains the blade configuration, date, and time information in the NVRAM when the blade is turned off.
You may need to replace the battery if an incorrect time or date is displayed during the boot routine.
You can operate the blade without a battery; however, the blade configuration information maintained by the battery in
NVRAM is erased each time you remove power from the blade. Therefore, you must re-enter the system configuration
information and reset the options each time the blade boots until you replace the battery.
1. Re-enter the time and date through the System Setup.
2. Remove the blade from the sleeve for at least one hour.
3. Install the blade in the sleeve.
4. Enter the System Setup.
If the date and time are not correct in the System Setup, replace the battery. If the problem is not resolved by
replacing the battery, see
NOTE: If the blade is turned off for long periods of time (for weeks or months), the NVRAM may lose its system
configuration information. This situation is caused by a defective battery.
NOTE: Some software may cause the blade's time to speed up or slow down. If the blade operates normally except
for the time maintained by the System Setup, the problem may be caused by a software rather than by a defective
battery.
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