WiFi Router Not Working — No Internet or Devices Can't Connect

Common Symptoms

• All devices show 'no internet' even though they're connected to WiFi
• Router WiFi network disappears from device list entirely
• Some devices connect but others can't see the network
• Internet worked until router was moved or power went out
• Router power LED is off or blinking abnormally
• Internet LED is solid amber/red instead of green
• Router runs hot and shuts down after extended use
• WiFi is slow or drops connections throughout the day

Most Likely Causes

1. 1

   Modem-Router Communication Failure — Power Cycle in Correct Sequence

   The most common cause of 'connected to WiFi but no internet' is a stale DHCP lease or corrupted ARP table between the modem and router. Your modem assigns your router's WAN IP address — if this lease expires or gets corrupted, the router has no valid internet path even though its WiFi is broadcasting normally. The fix is a full power cycle in the correct sequence: (1) Unplug BOTH the modem and the router from power. Wait a full 60 seconds — this clears the capacitors and forces a complete memory reset. (2) Plug in the MODEM FIRST and wait for it to fully synchronize with your ISP — look for the 'online' or 'internet' LED to turn solid green (this takes 60–120 seconds for cable modems, up to 3 minutes for DSL). (3) Only after the modem is fully online, plug in the ROUTER. Wait 60–90 seconds for it to acquire a new WAN IP from the modem. (4) Check internet on a device. If you plug the router in before the modem is online, the router never gets a valid WAN IP and you'll have WiFi with no internet — this is the most common mistake. For Eero and Google Nest WiFi systems, power cycle in the same sequence: modem → main Eero/Google hub → satellite units.

2. 2

   ISP Outage or Modem Failure — Eliminate Before Blaming the Router

   Before spending an hour troubleshooting your router, verify that the internet signal is actually reaching your home from your ISP. Two quick tests: (1) Plug a laptop or desktop directly into the modem with an Ethernet cable (bypassing the router entirely). If you get internet, your modem and ISP connection are fine — the problem is in the router. If you still get no internet, the problem is upstream from your router (ISP outage, modem failure, or coax/DSL line issue). (2) Check your ISP's outage map or status page: Comcast/Xfinity status.xfinity.com, AT&T att.com/outages, Spectrum spectrum.com/outage-center, or search your ISP name + 'outage' on Twitter/X for real-time reports. Modem failure symptoms: no 'online' LED on the modem even after 5 minutes, or online LED present but laptop direct-connected still shows no internet. Cable modem failure is common after 5–7 years and especially after nearby lightning storms. Most ISPs will replace a failed modem for free if it's rented equipment.

3. 3

   Overheating Shutdown — Router Throttles or Reboots After Extended Use

   Routers generate significant heat from their processors and radio chips, and many models will throttle WiFi performance or shut down entirely when they overheat. Overheating is the #1 cause of 'router works for an hour then drops connection.' Risk factors: (1) Router placed in an enclosed cabinet, shelf with walls on 3 sides, or inside an AV console with poor ventilation. (2) Router placed flat on carpet (blocks bottom vents). (3) Ambient temperature above 85°F (attic installation, direct sun exposure). (4) Thick dust buildup inside the router (common in homes with pets). Diagnosis: touch the router case after a connection drop — if it's too hot to hold your hand against for more than 2 seconds, overheating is the cause. Fix: (1) Move the router to an open, elevated location with 6+ inches of clearance on all sides. (2) Orient the router as designed — most should stand vertically with antennas pointing up. (3) Use a can of compressed air to blow dust out of all vents. (4) For chronic overheating, a small USB fan directed at the router vents is effective. Optimal router placement: central location in the home, 5–7 feet off the floor, away from microwaves, cordless phones, and baby monitors.

4. 4

   Channel Congestion — Switch Between 2.4GHz and 5GHz Bands

   WiFi channels are shared spectrum — in dense neighborhoods or apartment buildings, neighboring routers can saturate the same channels, causing slow speeds and dropped connections. The 2.4GHz band has 11 channels in the US (only 3 non-overlapping: 1, 6, 11); the 5GHz band has 23+ non-overlapping channels but shorter range. Common congestion scenarios: (1) 2.4GHz slowdowns: your router is on channel 6, and 5 neighbors are also on channel 6. Fix: log into your router admin panel (usually 192.168.1.1 or 192.168.0.1), navigate to Wireless Settings, and manually set the 2.4GHz channel to 1 or 11 instead of Auto. (2) Device can't connect at all: if your router is on 5GHz-only mode and the device is more than 40 feet away or separated by 2+ walls, the 5GHz signal is too weak. Fix: ensure your router broadcasts both 2.4GHz and 5GHz networks, or move the device closer. (3) Too many devices on 2.4GHz: most smart home devices (bulbs, plugs, cameras) use 2.4GHz — a router with 50+ 2.4GHz devices may struggle. Create a separate SSID for IoT devices or upgrade to a WiFi 6 router. To access router admin: Netgear routerlogin.net; Asus router.asus.com; TP-Link tplinkwifi.net; Linksys linksyssmartwifi.com.

5. 5

   Corrupted Configuration or Firmware — Factory Reset and Firmware Update

   Router firmware can become corrupted due to a power interruption during update, a failed automatic update, or simple data corruption after years of operation. Signs of firmware corruption: router reboots itself every few hours, admin interface is inaccessible, WiFi broadcasts but assigns 169.x.x.x addresses (APIPA addresses indicating DHCP failure), or specific features (port forwarding, QoS, parental controls) stop working. Firmware update procedure: (1) Log into the router admin panel. (2) Find Firmware Update or Advanced > Administration > Firmware Update. (3) Check for available updates — many routers update automatically, but automatic updates can also be the cause of a new problem. If a recent auto-update broke things, some routers allow you to roll back. Factory reset procedure: (1) With the router powered on, use a paper clip to press and hold the recessed RESET button on the back/bottom for 10–30 seconds until the power LED flashes. (2) Wait 3–5 minutes for the router to return to factory defaults. (3) Reconfigure your WiFi network name (SSID) and password — factory reset erases all custom settings including port forwarding rules, static IP assignments, and guest network configurations. Always note your ISP login credentials (for DSL/PPPoE connections) before factory resetting, as these will be required for reconnection.

Quick DIY Checks

1. 1Power cycle in sequence: Unplug the modem and router from power. Wait 60 full seconds. Plug in the modem first — wait for all LEDs to stabilize (60–120 seconds). Then plug in the router and wait 60 seconds. Test internet on a device. This resolves 70% of 'no internet' issues.
2. 2Read the LED indicators: Power LED solid = router is on. Internet/WAN LED: solid green = internet connected; amber/red = no WAN connection (ISP or modem problem); blinking = negotiating. WiFi LED: solid = broadcasting; off = WiFi disabled in settings. If the internet LED is red/amber, the problem is between your modem and ISP — not in your router.
3. 3Bypass test: plug a laptop directly into the modem with an Ethernet cable. If you get internet, the modem and ISP are fine and the router is at fault. If no internet direct to modem, call your ISP — your router is not the problem.

1. 4Check for overheating: feel the router case. If hot, move it to a well-ventilated location with 6+ inches of clearance on all sides. Blow out dust with compressed air. Allow to cool for 20 minutes and test.
2. 5Try a firmware update: log into the router admin (192.168.1.1 or 192.168.0.1), find the firmware update section, and update to the latest version. If the router was working before a recent auto-update, check if a rollback option is available.
3. 6Factory reset as a last resort: press and hold the reset button for 10–30 seconds. Reconfigure your SSID and password. Note your ISP login before resetting if you use DSL/PPPoE.

Repair vs Replace

Recommended Tools & Parts

• Surge Protector with Coax/Phone Line Protection (8-outlet, 1080J+)

  Surge protector with separate coax cable passthrough protection for the modem coax feed — the most commonly overlooked surge path that destroys modems. Look for 1080+ joule rating and separate coax/telephone ports. APC, Belkin, and Tripp Lite make reliable units. Essential protection for any home networking equipment.

  $20–$45

  Buy on Amazon →

• WiFi 6 Router — Dual Band (TP-Link AX1800 or Netgear RAX10)

  Entry-level WiFi 6 (802.11ax) router providing significantly better performance with multiple connected devices compared to older WiFi 5 routers. WiFi 6 handles 30+ simultaneous device connections efficiently — essential for smart homes. TP-Link Archer AX21 and Netgear RAX10 are highly rated at the $80–$100 price point.

  $80–$130

  Buy on Amazon →

• Mesh WiFi System — Eero or TP-Link Deco (2-pack)

  Two-node mesh WiFi system for homes over 2,000 sq ft or homes with dead zones caused by walls, floors, or distance. Amazon Eero and TP-Link Deco are the most reliable consumer mesh systems. Unlike a range extender (which creates a separate network and cuts bandwidth in half), a true mesh system provides seamless roaming with a single SSID.

  $150–$250

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

Related Repairs