Before you restart the router, look at it. The lights on the front are a diagnostic readout that tells you which part of the chain has failed, and reading them first can save you an hour and a pointless call to your provider. The trouble is that restarting the router erases the evidence, which is exactly what most people do first.
The short answer
Look at the lights before you restart anything, and note what each one is doing. The internet or online light is the important one: if it is off or red while the power and Wi-Fi lights are normal, the fault is your line or your provider, and nothing you do inside the house will fix it.
What each light usually means
Labels vary between makers but the functions are consistent.
- Power. Solid means the router has power and has booted. Flashing during startup is normal; flashing permanently means it is failing to boot, or is in recovery mode.
- Internet or Online. The connection to your provider. Solid means connected. Off or red means no connection. This is the single most informative light on the box.
- DSL, Broadband or Fibre. The physical line. Flashing means it is trying to synchronise, solid means it has. A light that flashes forever means the line itself is the problem.
- Wi-Fi or WLAN. The wireless radio. Off means Wi-Fi is disabled, which sometimes happens accidentally via a button on the back.
- Ethernet or LAN. One per port, lit when a cable is connected and active.
- WPS. Only active during pairing. Flashing at other times is unusual.
Photograph the lights before restarting. It takes two seconds and gives you something concrete to describe if you end up on the phone to your provider, who will ask exactly this question.
Reading the combinations
- Power on, everything else off. The router booted but nothing else initialised. Usually a router fault or a failed firmware update.
- Power and Wi-Fi on, internet off or red. Your home network is fine and the connection to your provider is down. Devices will connect to Wi-Fi and get nowhere.
- Broadband light flashing continuously. The line is trying and failing to synchronise. Points at cabling, a faulty filter, or a line fault outside.
- Everything solid but no internet on devices. The router thinks it is connected. Likely DNS, or an address pool that has run out.
- Power light flashing slowly, nothing else. Firmware recovery mode. Usually follows an interrupted update.
- All lights off. No power. Check the socket, the adapter and the cable before anything else.
Note every light before touching anything
Photograph the front panel. Restarting resets the state and you lose the evidence, which is the most useful thing you have.
Identify the internet light specifically
Check the manual or the label under the router if the icons are unclear. Knowing which light represents the connection to your provider is what makes all of this useful.
If the internet light is off, check the line connection
Unplug and firmly reseat the cable from the wall socket to the router. Check any filter or splitter is properly seated. Look for damage to the cable where it runs along skirting boards.
Check for a provider outage
With the internet light off and everything else normal, an outage is likely. Check the provider’s status page on mobile data before doing anything else.
Restart in the right order
Now you can restart. Unplug the router, wait a full minute, plug it back in and watch the lights come up in sequence. Note which light fails to reach its normal state, because that is where the chain breaks.
Check the router's own status page
Log into the router admin and look at the connection status and the system log. The log usually states the failure in plain terms, such as authentication failed or loss of synchronisation, and that language is exactly what a provider needs to hear.
Test with a computer on ethernet
If the Wi-Fi light is normal but wireless devices fail, connect a computer with a cable. Working on ethernet and failing on Wi-Fi narrows the problem to the wireless side.
Call the provider with specifics
Tell them which lights are in which state, how long it has been that way, and what the router log says. A call that starts with that information is dramatically shorter than one that starts with the internet not working.
Do not factory reset a provider-supplied router because a light is the wrong colour. Many need specific credentials to reconnect, and a reset without those leaves you offline until you can find them. Reset is close to a last resort, not a first step.
Colour conventions
Most manufacturers follow the same rough scheme, though there are exceptions worth checking in your manual:
- Green or white: working normally.
- Amber or orange: working but degraded, or still connecting. On some routers amber means connected at a slower standard than expected.
- Red: a failure, usually of the internet connection.
- Blue: varies widely. On some routers it means a pairing or setup mode rather than normal operation.
- Flashing: activity or an attempt in progress. Flashing is rarely an error on data lights, where it just means traffic.
What does a red internet light mean?
No connection to your provider. Your home network still works, and devices will connect to Wi-Fi, but nothing will reach the internet. Check for an outage and reseat the line cable.
Is a flashing light always bad?
No. On ethernet and Wi-Fi lights, flashing means data is moving, which is normal. On the broadband or internet light, continuous flashing means it is trying and failing to connect, which is not.
Why is my Wi-Fi light off?
Usually the wireless has been disabled, either by a physical button on the router, a schedule in the settings, or a guest network timer. Check the button first.
Should I turn the router lights off at night?
Many routers offer this and it does not affect performance. Just remember you have done it, because a router with the lights disabled is considerably harder to diagnose later.
What does it mean if all lights are on but there is no internet?
The router believes it is connected. The likely causes are DNS failure or an exhausted address pool, both of which a restart usually clears.
The bottom line
Look before you restart, and photograph what you see. The internet light is the one that divides problems into yours and your provider’s, and knowing which side you are on before you start troubleshooting saves most of the wasted effort. The router log turns a vague complaint into a specific one, which is what gets a fault fixed quickly.
