Ethernet Port Not Working: How to Fix a Wired Connection

Published 2026-10-16 · LuxuriousComputers Repair

You plug an ethernet cable into your computer and nothing happens — no internet connection, no network access. The ethernet port light may not turn on, or it may blink but Windows shows No Internet or Unidentified Network. A wired connection that does not work is frustrating because ethernet is supposed to be the reliable option. Here is how to diagnose whether the problem is the cable, the port, the driver, or the network configuration.

Check the physical connection

Look at the port lights

Most ethernet ports have two small LEDs — one green (link) and one amber or orange (activity). When a cable is properly connected to a working network:

• Green light solid: The physical link is established — the cable is good and both ends are connected to working hardware
• Amber light blinking: Data is flowing — the connection is active
• No lights at all: No physical link detected. The problem is either the cable, the port on the computer, or the port on the router or switch
• Green light on but no amber activity: Physical link exists but no data is flowing. Usually a driver or configuration issue rather than a hardware problem

Try a different cable

Ethernet cables can fail — internal wires break from repeated bending, the plastic clip on the connector breaks (causing the cable to sit loosely in the port), or the connector pins corrode. Try a different cable, preferably one you know works with another device. Make sure you hear the click when inserting it into the port — a cable that does not click is not fully seated.

Try a different port on the router

If your router or switch has multiple ethernet ports, try a different one. Individual ports on routers can fail while the rest work fine. If the connection works on a different port, the original port on the router is the problem.

Try the cable on a different device

Connect the same cable to a different computer or device (a laptop, a game console, a smart TV). If that device connects successfully, the problem is with your computer's ethernet port or software, not the cable or network.

Windows network troubleshooting

Check if the adapter is disabled

The ethernet adapter in Windows can be disabled — either intentionally, by a previous user, or by a Windows update:

1. Open Settings, Network and Internet, Advanced Network Settings (Windows 11) or Network and Internet, Change Adapter Options (Windows 10)
2. Look for your ethernet adapter — it may be called Ethernet, Local Area Connection, or show the NIC brand name (Realtek, Intel, etc.)
3. If it shows Disabled, right-click and select Enable
4. If it shows Not Connected, the physical link is not detected (go back to checking the cable and port lights)

Run the Windows network troubleshooter

Right-click the network icon in the taskbar and select Troubleshoot Network Problems (Windows 10) or go to Settings, System, Troubleshoot, Other Troubleshooters, Network Adapter (Windows 11). The troubleshooter checks common configuration issues including disabled adapters, incorrect IP settings, and DNS problems.

Release and renew the IP address

If the adapter is enabled and the cable is connected but you have no internet, the computer may not have obtained a valid IP address from the router:

1. Open Command Prompt as administrator (search for cmd, right-click, Run as Administrator)
2. Type ipconfig /release and press Enter
3. Type ipconfig /renew and press Enter
4. Type ipconfig and press Enter to see your current IP address

If the IPv4 address shows 169.254.x.x, the computer could not reach the DHCP server (your router) to get an address. This usually means the physical connection is not working properly even if the link light is on, or the router's DHCP server is not responding.

Reset the network stack

If releasing and renewing the IP does not help, a deeper reset of the Windows network stack can fix corrupted settings:

1. Open Command Prompt as administrator
2. Run these commands one at a time: netsh winsock reset netsh int ip reset ipconfig /flushdns
3. Restart the computer

These commands reset the Winsock catalog (which manages network connections), the TCP/IP stack, and the DNS resolver cache. This fixes a wide range of network issues caused by corrupted network configuration.

Driver issues

Check the driver in Device Manager

1. Right-click the Start button and select Device Manager
2. Expand Network Adapters
3. Look for your ethernet adapter (Realtek PCIe GBE, Intel Ethernet, etc.)
4. If it has a yellow warning triangle, the driver has a problem
5. If it is missing entirely, Windows is not detecting the network hardware — this could be a hardware failure or a completely missing driver

Update or reinstall the driver

Right-click the ethernet adapter in Device Manager and select Update Driver, then Search Automatically. If Windows does not find a newer driver, try the manufacturer's website — Realtek, Intel, and other NIC manufacturers provide direct driver downloads. For the most complete fix, uninstall the driver (right-click, Uninstall Device, check the box to delete the driver software), restart the computer, and let Windows install a fresh driver automatically.

After a Windows update

Windows updates sometimes replace working network drivers with generic ones that do not function properly. If ethernet stopped working after a Windows update, check the update history (Settings, Windows Update, Update History) and uninstall the most recent updates to test. You can also roll back the driver: in Device Manager, right-click the adapter, Properties, Driver tab, Roll Back Driver.

Hardware failure

USB ethernet adapter as a workaround

If the built-in ethernet port has failed and you need a wired connection, a USB ethernet adapter is an inexpensive solution. USB 3.0 gigabit ethernet adapters cost $15 to $25 and provide full gigabit speeds. They are plug-and-play on Windows 10 and 11 — no driver installation needed in most cases. This is often a practical permanent solution if the built-in port has failed, since replacing the built-in port on a desktop requires a new motherboard or a PCIe network card, and on a laptop requires a motherboard-level repair.

PCIe network card (desktops)

For desktop computers, a PCIe network card ($15 to $40 for gigabit, $30 to $60 for 2.5 gigabit) plugs into an available PCIe slot and provides a new ethernet port. This is a cleaner solution than a USB adapter for a permanent desktop setup — no dongle to lose and no USB port consumed.

Ethernet help in Marion

If your ethernet port is not working and the troubleshooting steps above have not resolved it, LuxuriousComputers Repair can test the port, cable, and network configuration, diagnose whether the issue is a driver problem, a port failure, or a network configuration issue, and install a replacement network adapter if the built-in port has failed.