The router fails to load a previously saved configuration. One of these error messages may be observed:
System Bootstrap, Version 11.1(8)CA1, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)
Copyright (c) 1997 by cisco Systems, Inc.
Warning: monitor nvram area is corrupt ... using default values
Warning: NVRAM size is 0
environment checksum in NVRAM failed
Router#show startup-config%Error opening nvram:/startup-config (Invalid Checksum)Router#
%Error opening nvram:/startup-config (Invalid Checksum)
These error messages usually indicate a hardware failure. To verify, issue the test memory command. This is an example of the command output:
Router#test memoryTest NVRAM card [y/n] ? yFailed
Test NVRAM card [y/n] ? y
Issue the write erase command and reload the router. If the issue persists, the hardware will need to be replaced.
When hardware replacement is indicated, perform one of these options: