The lights on your Openreach modem let you know when everything's working as it should be and can tell you what's wrong if you're having problems with your connection. This table shows the light status of the router Light Status Description Power On Your modem is powered on. Off Your modem isn't getting any power. Make sure the power supply is plugged into a wall socket and switched on. DSL On Your modem is connected to the network. Blinking Your modem is being activated and connecting to the network. Off Your modem is not connected to the network. Make sure all cables are securely connected. Internet On Your modem is connected to the Internet. Off Your modem isn't connected to the internet. Check all cables are securely connected. LAN On The Ethernet cable is connected to your modem and router. Blinking Data is being sent through the Ethernet cable connected to your modem and router. Off The Ethernet cable may have become loose. Check that it's still plugged securely into your modem and router.