The condition of the connection between your router and the devices connected to it is shown by the LEDs on your router. They also show you how your Internet, WiFi, Ethernet, and WPS connections are. When the cable modem is hooked in, all LEDs are turned out. Ensure the power cord is linked to your cable modem and the power supply adapter is plugged into a working outlet. Ensure you're using the NETGEAR 12 VDC, 1.5A power adapter for Netgear modem lights.
If the fault persists, there was a hardware issue. Please get in touch with Technical Support.