Ethernet Not Working

Ethernet may stop working due to cable issues, router problems, incorrect network settings, driver failures, or hardware faults. This guide walks through the most common causes and how to fix them.

Common Symptoms

  • No internet connection through Ethernet
  • “Unidentified network” message
  • Ethernet shows “No network access”
  • Yellow triangle or red X on the network icon
  • Ethernet works on other devices but not this one

Possible Causes

  • Loose or damaged Ethernet cable
  • Router or modem issues
  • Disabled Ethernet adapter
  • Incorrect IP or DNS settings
  • Outdated or corrupted network drivers
  • Faulty Ethernet port

Step 1 – Check the Ethernet Cable

  1. Ensure the cable is firmly plugged into the PC and router.
  2. Try a different Ethernet cable if available.
  3. Test the cable on another device to confirm it works.

Step 2 – Restart Your Router and Modem

  1. Unplug both devices from power.
  2. Wait 30 seconds.
  3. Plug the modem back in and wait for it to fully start.
  4. Plug the router back in and wait for it to fully start.

Step 3 – Check the Ethernet Adapter Status

  1. Open Settings → Network & Internet.
  2. Select Advanced network settings.
  3. Locate your Ethernet adapter.
  4. Ensure it is Enabled.

Step 4 – Run the Network Troubleshooter

  1. Open Settings.
  2. Go to System → Troubleshoot.
  3. Select Other troubleshooters.
  4. Run the Network Adapter troubleshooter.

Step 5 – Reset IP and DNS Settings

  1. Press Start and type cmd.
  2. Right‑click Command Prompt and choose Run as administrator.
  3. Run the following commands:
ipconfig /release
ipconfig /renew
ipconfig /flushdns

Step 6 – Update or Reinstall the Ethernet Driver

  1. Right‑click the Start button and select Device Manager.
  2. Expand Network adapters.
  3. Right‑click your Ethernet adapter.
  4. Select Update driver.
  5. If issues continue, choose Uninstall device and restart.

Step 7 – Check Router LAN Ports

If one LAN port is faulty, try plugging the cable into another port on the router.

Step 8 – Test Ethernet in Safe Mode

If Ethernet works in Safe Mode, a third‑party program may be interfering.

Step 9 – Reset Network Settings

  1. Open Settings.
  2. Go to Network & Internet.
  3. Select Advanced network settings.
  4. Choose Network reset.

When to Seek Professional Help

  • Ethernet does not work on any device
  • Router LAN ports fail consistently
  • Ethernet adapter does not appear in Device Manager
  • Hardware damage is suspected
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