Startup-config is not present Why does this message appear?

The message "Startup-config is not present" typically appears on network devices, such as routers or switches, when the device fails to find its saved configuration file in non-volatile memory (NVRAM) upon boot-up. This can occur if the configuration file has never been saved, was deleted, or if there is a hardware issue with the NVRAM. As a result, the device will load with default settings, requiring reconfiguration to restore desired settings and functionality.