Change your TP-Link Wi-Fi password at tplinkwifi.net or in the Tether app: the exact menu for your router, the default password, and what to do if it fails.

Router lights explained: the four jobs every indicator set does, the healthy state for TP-Link, Netgear, eero and Motorola, and why colours are not universal.

eero light is solid white but there is no internet? The eero thinks it is online, so check the app, reboot the eero, check the modem, then the device.

eero light colours and blinking patterns: solid white is online, solid red is offline, blue is setup, yellow is a power problem. Every state in one table.

Motorola cable modem lights explained: Power, Downstream, Upstream and Online states, what green and blue mean, and how to read them for a diagnosis.

TP-Link extender lights explained: the RE/WPS light reports pairing, the Signal lights show connection and strength, and they tell you where to place the extender.

TP-Link Deco light colours explained: solid green or white is normal, solid yellow is starting up, blue is setup, pulsing green is firmware and red is a fault.

A red light on a TP-Link router is the Internet LED: the router is running but has no internet from the modem or line. The five checks that fix it, in order.