Internet does not come back after a power outage
Request
The power came back, the modem and router have lights again, but websites still do not load.
Do not factory-reset the router yet. After a power outage, the usual question is not “is Wi-Fi broken?” but “which layer came back in the wrong state?”
Check it in this order: ISP signal, modem or ONT, router WAN address, then mesh/extenders and devices. If the modem or ONT is not online, the router cannot fix it. If the modem is online but the router has no WAN address, the router may have booted too early or kept a stale lease.
If you ask for help, attach only one photo of the modem/ONT lights, one router WAN status screenshot, and one sentence with the boot order you tried. That is enough to tell whether we should focus on ISP, router WAN lease, mesh, DNS, or one device. Hide account numbers, public IPs, Wi-Fi passwords, serial numbers, and customer IDs.
- Turn off mesh nodes, extenders, switches, and PCs for the first test. Leave only modem/ONT and the main router.
- Power the modem or ONT first. Wait until the ISP/online/PON/Internet light reaches its normal stable state.
- Power the main router after that. Wait two or three minutes, then open the router app or admin page and check WAN/Internet status.
- If the router has no WAN address, reboot only the router once after the modem is already stable. If it gets a WAN address after that, the problem is likely boot order or lease recovery.
- If the modem/ONT never reaches a normal online state, stop working on Wi-Fi and check ISP outage status or contact the ISP.
If the line/service light is red, blinking forever, or off, treat this as ISP-side until proven otherwise. If WAN IP is blank, 0.0.0.0, or disconnected, the router is not properly attached to the upstream device yet. If WAN looks normal, test one wired or nearby Wi-Fi device before bringing mesh nodes back.
Do not factory-reset the router, delete Wi-Fi settings, open ports, change DNS everywhere, or replace the router before the modem/ONT and WAN-address checks.
If the internet comes back only after a manual reboot, that pattern is useful. It often means the modem/ONT and router are racing each other after power returns. The router may ask for a WAN address before the upstream device is ready, then never tries again cleanly.
Try this once:
- Unplug router and mesh nodes.
- Leave the modem/ONT powered for five minutes.
- Plug in the main router and wait until WAN/Internet is connected.
- Plug in mesh nodes or extenders after the router is online.
If this sequence works repeatedly, you can make the setup more reliable by keeping the modem/ONT and main router on a small UPS, or by changing router settings only after checking the manual. Do not buy hardware first if the ISP line itself drops during outages; a UPS cannot keep upstream neighborhood equipment alive.
Stop here and add details if the modem/ONT says no signal, LOS, offline, or stays red; WAN IP is private or missing in a bridge/static/double-NAT setup; internet works directly from the modem but not through the router; or you smell heat, see a damaged outlet, or the breaker trips again.
Related Price2Click guides: if the outage showed that your modem/router need backup power, start with our UPS buying guide. If the issue is mostly weak coverage after the network comes back, use Fix Home Wi-Fi. If only one Windows device is connected but cannot browse, use Wi-Fi says connected, but websites do not open in Windows.