You're in a game lobby, your ping spikes, and the connection drops — but your phone is streaming 4K on Wi-Fi just fine. The router lights are blinking, so why is your Ethernet dead?
If you're dealing with an ethernet cable not working but wifi is situation, here's the good news: your internet service is fine. Wi-Fi and Ethernet are separate paths, and when one works while the other doesn't, the fault is isolated to the wired chain — the cable, the router's LAN port, your network adapter, its driver, or the IP configuration.
This isn't your ISP's problem. And in most cases, it's fixable in under five minutes with zero special tools.
I've spent the better part of 15 years diagnosing network failures — both in enterprise settings and in my own home lab, where I've probably cursed more Cat6 cables than I care to admit. Let me walk you through the exact process I use, from two-minute quick fixes to deeper diagnostics.
Fix Ethernet Cable Not Working in 5 Minutes: Try These First
Before you dive into Device Manager or run command-line resets, start with the boring stuff. You'd be surprised how often this turns out to be a physical connection issue.
1. Check the Cable and Use the Correct LAN Port
Walk over to your router and look at where that Ethernet cable ends. Is it plugged into a LAN port (usually numbered 1 through 4) or the Internet/WAN port that runs to your modem? I cannot tell you how many times I've seen people plug their PC into the WAN port and then wonder why they have no internet.
The cable should click firmly into place on both ends. If it doesn't click, the locking tab is probably broken — and that's an instant red flag.
Now check the port LEDs. A steady or blinking link light on both the router and your PC's Ethernet port means a physical connection exists. If the port is dark, reseat the cable on both ends. A loose connection is the #1 cause of this exact symptom.
2. Restart Your Modem and Router in the Right Order
This sounds too easy to work, and that's precisely why most people skip it. But a proper power cycle clears stuck DHCP leases and stale routing tables.
- Unplug both the router and modem power cables.
- Wait at least 30 seconds. Actually wait — don't just count to five.
- Power on the modem first. Wait for its lights to stabilize.
- Then power on the router. Give it a few minutes to boot fully.
If you have a modem/router combo unit, just unplug and replug that single device. I keep a 30-second timer on my phone for this, because I'm terrible at waiting.
3. Run the Built-In Network Troubleshooter
Windows has a built-in network troubleshooter that's more useful than most people give it credit for.
- Windows 11: Settings > System > Troubleshoot > Other troubleshooters > Network and Internet
- Windows 10: Settings > Network & Internet > Status > Network troubleshooter
It automatically checks for DHCP failures, driver problems, and DNS faults. It won't fix everything, but it's a solid first pass that takes about a minute — and sometimes that's all you need.
4. Disable and Re-enable the Ethernet Adapter
This is the software equivalent of turning something off and on again.
- Windows 11: Settings > Network & internet > Advanced network settings > More network adapter options
- Right-click your Ethernet adapter, select Disable, wait five seconds, then select Enable.
This resets the NIC driver state without forcing a full reboot. I also use it as a diagnostic cue — if the connection comes back after re-enabling, you're looking at a driver-level issue, not a cable problem.
Why Is My Ethernet Not Working but WiFi Is? A 3-Step Diagnosis Tree
Still stuck? Let's stop guessing and start diagnosing. The fastest way to resolve this is to figure out which layer is broken — physical, driver, or configuration. Here's the 3-step decision tree I walk every client through.
Step 1: Read the Lights — Router vs. Adapter LEDs
Your router's Ethernet port lights tell you more than any diagnostic software can.
| Light State | What It Means | Likely Fault Layer |
|---|---|---|
| Solid or blinking green/amber | Cable and port are physically linked | Not physical — move to software |
| Dark port | No link detected | Cable, port, or device hardware |
| Link light on, but no internet | IP/DNS/OS issue | Configuration or driver |
| If the link light is on but there's no internet, don't bother swapping cables yet. The problem lives in the IP or DNS layer. If the port is dark, keep reading — we're about to find out why. |
Step 2: Check Device Manager for Adapter Errors
Open Device Manager and expand Network adapters. Look for a yellow exclamation mark next to your Ethernet adapter.
- Error Code 10 ("This device cannot start") points to a driver or hardware failure.
- Error Code 56 ("The device is not working properly") usually means the adapter is physically dead or disabled in the BIOS.
If the adapter is missing entirely from Device Manager, it might be disabled in BIOS — or, worst case, fried. I've seen surge damage wipe out an Ethernet port while leaving the rest of the motherboard completely fine.
Step 3: Isolate the Fault with a Second Device or Cable
This is the most valuable 60 seconds you'll spend in the entire troubleshooting process.
- Plug the same cable into a laptop or game console. It works? The cable and router port are fine — the problem is your PC.
- Plug a different known-good cable into your PC. It works? The original cable is faulty.
- Both fail on different devices? Suspect the router's LAN port, the wall jack, or — in rare cases — the modem itself.
This simple swap test tells you exactly where to focus your energy. Stop randomly changing settings; let the hardware tell you where the fault lives.
Ethernet Cable Not Detected? How to Test and Replace It
If your ethernet cable not detected error persists, it's time to examine the cable itself. Because yes — cables absolutely can and do fail.
Visual Inspection: Connectors, Bent Pins, and Kinks
Look at the RJ45 plug on both ends. The plastic locking tab should be intact, and the 8 gold pins should be flat and evenly spaced. If a pin is bent, the cable is done. Don't try to bend it back. Replace it.
Run your fingers along the cable's full length. Feel for sharp kinks, cuts, or exposed wire. Pay special attention to spots where the cable passes under furniture, around door frames, or behind desks. Pets love cables. Chairs crush them. Radiators cook them.
If you spot visible damage, replace the cable. It's the cheapest fix on this entire page.
Use a Cable Tester to Prove the Ethernet Cable Is Working
A basic cable tester costs $10–$30 and checks all 8 wires inside the cable. Plug one end into the transmitter, the other into the receiver, and watch the LEDs.
- LEDs light in order 1 through 8 → the cable is good.
- A missing LED → a broken wire somewhere.
- An out-of-order LED → the cable is miswired.
This tool is invaluable if you're testing in-wall cables or cables you've crimped yourself. I keep one in my toolbox at all times — it's saved me hours of chasing down what turned out to be an intermittent connection fault.
The 10-Second Swap Test (and Which Replacement Cable to Buy)
Unplug the current cable and connect a known-good spare to the same port. Internet returns? Done. Replace the original cable.
When buying a replacement, skip the bargain-bin options. For gigabit home networks, I recommend:
- Cat6 or Cat6a with pure copper conductors.
- Avoid copper-clad aluminum (CCA) cables. They corrode faster and cause those maddening intermittent link drops that are nearly impossible to diagnose. | Cable Type | Max Speed | Best For | |---|---|---| | Cat5e | 1 Gbps up to 100m | Short runs, budget builds | | Cat6 | 10 Gbps up to 55m | Most home networks | | Cat6a | 10 Gbps up to 100m | Long runs, future-proofing |
Fix Ethernet Not Working on Windows 10 and 11: Step-by-Step
If you've confirmed the cable and port are healthy, it's time to dig into software. This is where the fix ethernet not working battle is usually won.
One important note for 2026: Windows 10 reached end of support on October 14, 2025. If you're still on Windows 10, these steps work — but I strongly recommend moving to Windows 11 for security updates.
Run Network Commands to Reset TCP/IP and Get a New IP
Open Command Prompt as Administrator and run these commands in order:
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns
Before running these, verify your adapter's IPv4 properties are set to Obtain an IP address automatically. A stale static IP is one of the most common causes of Ethernet that connects but never actually loads a page.
These commands fix stuck DHCP leases, IP address conflicts, and corrupted network stacks. If the connection doesn't return immediately, restart the PC. I once spent an hour chasing a phantom DNS issue that these five commands resolved in 30 seconds.
Update, Roll Back, or Reinstall the Network Adapter Driver
Open Device Manager > Network adapters. Right-click your Ethernet adapter and choose Update driver.
- If Ethernet worked before a recent Windows update, try Roll back driver first.
- If rollback isn't available, download the OEM driver from your PC manufacturer's website — not a third-party driver updater.
- When uninstalling, check "Attempt to remove the driver for this device," then restart Windows.
Windows will automatically reinstall a fresh driver on reboot. In my experience, roughly 80% of driver-related Ethernet failures on Windows 11 trace back to a bad Windows update that a simple rollback resolves.
Disable Power Saving on the Ethernet Adapter
This one is sneaky. Windows can turn off your Ethernet adapter to save power — and it doesn't always wake it back up correctly.
Go to Device Manager > adapter Properties > Power Management tab. Uncheck "Allow the computer to turn off this device to save power."
I've seen this fix issues where the wired connection drops whenever the PC sits idle and only comes back after a reboot. If you have an older router, also consider disabling "Energy Efficient Ethernet" in the Advanced tab.
Force a Consistent Link Speed (Speed & Duplex)
In adapter Properties > Advanced, set Speed & Duplex to "1.0 Gbps Full Duplex" — or "100 Mbps Full Duplex" for older cables or longer runs.
This resolves flaky gigabit negotiation, which is surprisingly common with marginal or overly long cable runs. If the setting helps but the issue keeps returning, the cable is the weak link. Replace it.
| Router Port Speed | Suggested Setting |
|---|---|
| 100 Mbps | 100 Mbps Full Duplex |
| 1 Gbps | 1.0 Gbps Full Duplex |
| 2.5 Gbps | 2.5 Gbps Full Duplex (if available) |
Use Windows Network Reset as a Last Resort
- Windows 11: Settings > Network & internet > Advanced network settings > Network reset
- Windows 10: Settings > Network & Internet > Status > Network reset
Network reset removes all adapters and their settings, then reinstalls them with defaults. Back up VPN or Hyper-V configs first — you'll need to reconfigure those from scratch. After the reset, confirm the adapter is set to DHCP, then reboot.
I treat Network Reset as the nuclear option: it works, but it's disruptive. Exhaust the other fixes first.
Ethernet Not Working on Xbox, PS5, or Smart TV? Device-Specific Fixes
Consoles and smart TVs have their own quirks. Here's how to handle each one.
Ethernet Not Working on Xbox: Restart, Port, and DNS
First, do a full power cycle: power off the console, unplug it for 30 seconds, then plug it back in. This clears the console's network cache, and it fixes a surprising number of Xbox Live connectivity issues.
If the Xbox detects the cable but internet still fails, go to network settings and manually set DNS to 8.8.8.8 and 8.8.4.4. Xbox Live can be unusually picky about DNS responses.
Also try a different cable and router LAN port. The console's Ethernet port can fail, but it's the least likely culprit — check the cable first.
Ethernet Not Working on PS5: Reset Network Settings
Go to Settings > Network > Settings > Set Up Internet Connection. Choose the wired connection and run Easy setup.
Then run Test Internet Connection and watch for an IP address error. If you see a code like NW-102315, that indicates a DHCP failure — try a different LAN port on your router. Some routers reserve specific ports for IPTV or other services, and that reservation can block your PS5.
Ethernet Not Working on Smart TV: Force a Static IP
Smart TVs are notorious for flaky DHCP clients. If the TV reports "No network connection" despite a cable link, a DHCP failure is often the root cause. Try assigning a static IP in the TV's network menu.
Use the same subnet as your router. For example:
- IP: 192.168.1.100
- Subnet mask: 255.255.255.0
- Gateway: 192.168.1.1
- DNS: 8.8.8.8
One more thing worth knowing: many TVs have 100 Mbps Ethernet ports, not gigabit. If you're testing a "slow" wired connection on a TV, check its port speed before blaming the cable.
Can't Fix Your Ethernet Port? These Wired Alternatives Actually Work
If your Ethernet port is physically dead, you're not out of options. Here's what actually works.
USB-to-Ethernet Adapter: A Quick Workaround for Laptops and Mini PCs
If the built-in Ethernet port is damaged, a USB 3.0 or USB-C-to-Ethernet adapter restores a wired connection in minutes. This is also the only wired option for laptops that don't include an Ethernet port at all.
Choose based on the controller chip inside: Realtek RTL8156 for 2.5G speeds, Intel for maximum reliability. I've had good results with both, though Intel-based adapters tend to produce fewer driver headaches on Windows.
Powerline Adapter: Extend a Wired Connection Through Your Electrical Wires
Powerline adapters use your home's electrical wiring to carry data. Plug one in near your router, connect it via Ethernet, then plug a second one into any wall socket in the room where you need a wired port.
They're perfect for bypassing a damaged in-wall Ethernet run or working around a broken PC Ethernet port. But they won't help if the router's LAN port itself is dead.
One practical tip: plug powerline adapters directly into wall sockets, not power strips. I've seen power strips cut powerline throughput drastically — in one case, a strip dropped speeds from 500 Mbps to under 100 Mbps.
When to Call Your ISP or a Professional
If every device fails on Ethernet while Wi-Fi works on the same router, the router's LAN side is faulty — contact the router manufacturer.
If the modem or ONT itself shows no LAN link light, call your ISP. The modem's port may be damaged, and that's their equipment to replace.
Before you call, gather this information: your device's IP configuration, the router model number, the cable type, and how many devices are affected. It'll save both of you a lot of back-and-forth.
Frequently Asked Questions
Why is my Ethernet not working but my Wi-Fi is?
Wi-Fi and Ethernet use completely different hardware paths. If Wi-Fi works, your ISP, modem, and router are functioning correctly. The fault is isolated to the cable, the router's LAN port, your PC's network adapter, or its driver. Walk through the 3-step diagnosis tree above and you'll pinpoint it in minutes.
Why is my Ethernet cable connected but not working?
A "connected" link light only means the physical connection exists. If the internet won't load, the problem is usually IP or DNS related. Run ipconfig /release, ipconfig /renew, and ipconfig /flushdns in an administrator Command Prompt. Make sure the adapter is set to DHCP. Then disable and re-enable the adapter.
How do I test if an Ethernet cable is working?
Three checks. First, visually inspect the RJ45 connector and the cable's full length for damage. Second, swap it with a known-good cable — if the internet returns, the original cable is faulty. Third, use a cable tester to confirm all 8 wires light up in order. If any check fails, replace the cable.
Can an Ethernet cable just go bad?
Yes. Corrosion on the gold pins, repeated bending near the connector, pet bites, or furniture crushing can break conductors or short pairs. Symptoms include intermittent connectivity, speed drops, or a completely dead link. A good Cat5e or Cat6 cable can last years, but any cable can eventually fail.
Ethernet suddenly stopped working but Wi-Fi still works — what should I do?
Recent changes are the first suspects: a Windows update, a driver update, an IP address conflict, or a cable that just got pinched by a piece of furniture. Run ipconfig /renew to rule out an IP conflict, check Device Manager for a driver rollback option, reseat the cable on both ends, and if the issue started after a Windows update, use Network Reset.
How do I get Ethernet to work instead of Wi-Fi on Windows?
Windows normally gives Ethernet a lower interface metric and prefers it when both connections are active. If that's not happening, open PowerShell as Administrator and run Get-NetIPInterface to view interface metrics, then Set-NetIPInterface -InterfaceMetric to assign Ethernet a lower value than Wi-Fi.
Final Thoughts
Here's the thing about ethernet cable not working but wifi is situations: they look intimidating, but they're almost never mysterious. Follow the diagnose-first order — quick checklist, LED and adapter diagnostics, swap test, then software fixes — and you'll identify the fault layer within minutes.
If the cable and router port are healthy, the culprit is almost always a Windows driver, DHCP, or DNS setting. Not your ISP. Not bad luck. And if a bad cable is the cause, remember that replacing it is the cheapest fix on the planet.
Bookmark this guide for your next network hiccup — or better yet, share it with someone who's still wrestling with a dead wired connection. And if a fix here worked for you, leave a comment with your device, the error code you saw, and which solution finally did the trick. Your experience might be exactly what someone else needs.