Internet & modems

Ethernet port on a computer or laptop isn't working

A dead Ethernet port on a computer usually shows as no lights or no network detected when a cable is plugged in, and is caused by a driver issue, a bad cable, or occasionally a failed port, testable by process of elimination.

Difficulty
Moderate
Time
15–30 minutes
DIY cost
$10–$30
Pro cost
$50–$150

Symptoms

  • No lights appear next to the Ethernet port when a cable is plugged in
  • Computer shows 'network cable unplugged' despite a cable being connected
  • Ethernet worked before and stopped after an update or a fall/bump to the device
  • Wi-Fi works fine but Ethernet specifically doesn't

Likely causes

  • CommonFaulty or damaged Ethernet cableA cable with an internal break can appear intact while failing to carry a signal.
  • CommonEthernet adapter driver issue or needs updatingA missing or corrupted driver can prevent the port from being recognized properly by the operating system.
  • PossiblePort on the router or switch side has failedThe problem may be with the other end of the connection, not the computer's own port.
  • PossiblePhysical damage to the computer's Ethernet portEthernet ports can be bent or damaged internally from cable strain or impact.

What to do

  1. Try a different, known-good Ethernet cable in the same port.
  2. Plug the same cable and computer into a different port on the router or switch to rule out an issue on that end.
  3. Check the operating system's network settings or Device Manager (Windows) for the Ethernet adapter; look for a warning icon or 'disabled' status.
  4. Update or reinstall the Ethernet adapter driver from the manufacturer's website.
  5. Restart the computer, since a stuck network service can sometimes prevent the port from initializing properly.
  6. Inspect the port itself with a flashlight for visible damage, bent pins, or debris, without inserting anything into it.
  7. If the port shows no lights and no detection across multiple cables and other devices' ports, the computer's Ethernet hardware has likely failed and a USB-to-Ethernet adapter is a practical workaround.

Tools and parts

  • Spare Ethernet cable
  • Flashlight
USB to Ethernet adapterSearch: “usb ethernet adapter”

When to call a pro

If the built-in Ethernet port has failed, a computer repair shop can sometimes replace it, though for laptops a USB-to-Ethernet adapter is usually the more practical and affordable fix.

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.