Internet & modems

Internet doesn't come back after a power outage

After power returns following an outage, internet equipment sometimes needs a manual restart or extra time to resync with the provider's network, and if it still doesn't return, the provider's own equipment upstream may still be recovering.

Difficulty
Easy
Time
10–30 minutes
DIY cost
$0–$30
Pro cost
$0–$100

Symptoms

  • Power is back on in the house but internet still isn't working
  • Modem's lights show an abnormal pattern after power returned
  • Neighbors' internet may also be affected if power was out to a wider area
  • Modem seems to be stuck cycling through its startup sequence

Likely causes

  • CommonModem or router simply needs more time to resync after power returnsModems can take several minutes to complete their startup and connection process, longer than a typical restart.
  • CommonProvider's local equipment (nodes, amplifiers) still without power or restarting after the outageA wider power outage can leave shared neighborhood equipment offline even after your home's power returns.
  • PossibleRouter or modem's battery backup (if equipped) drained during an extended outageEquipment with battery backup for phone service can behave differently when its battery is fully depleted versus running normally.
  • PossiblePower surge during the outage or when power returned damaged equipmentPower fluctuations during outages and restoration can occasionally damage sensitive electronics.

What to do

  1. Wait at least 5–10 minutes after power returns before assuming there's a separate problem, since modems can take a while to fully resync.
  2. Manually restart the modem and router by unplugging both for 30 seconds and plugging them back in, modem first.
  3. Check your provider's outage map, since a power outage affecting your home likely affected their local equipment too, which may take longer to recover.
  4. If the modem has a battery backup and the outage was extended, allow extra time for the battery to begin recharging, which can affect how the device behaves initially.
  5. Check if the modem or router shows any signs of damage or unusual behavior that suggests a power surge issue, and try it in a different outlet if possible.
  6. If a surge is suspected, consider whether a surge protector should be added for the equipment going forward.
  7. If internet still doesn't return well after power is confirmed stable at your home and there's no listed outage, contact your ISP, since equipment may need to be reset remotely or replaced.

Tools and parts

Surge protector power stripSearch: “surge protector power strip”

When to call a pro

If your ISP's local infrastructure was also affected by the outage, they may need time to restore their own equipment; if it takes unusually long, follow up with their support line.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.