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Written by Tech Support in Computers & Internet, Connection Cables, How to, WiFi
Nov 13 th, 2026
Quick answer: If a computer shows an Ethernet connection but websites, apps, or online services will not load, the cable may be connected while the device is still missing a working path to the internet. Start by checking the cable, the router’s correct LAN port, and whether another wired device works. Then isolate the problem to the computer, its Ethernet adapter, the router or modem, or the internet provider—before resetting anything.
Ethernet is often more dependable than Wi-Fi, but a wired connection can still fail in ways that are confusing. A link light may be on, Windows or macOS may say “connected,” and yet there may be no usable internet connection. This guide focuses on the wired path: Ethernet cables, LAN ports, network adapters, DHCP and IP-address problems, and practical testing.
An Ethernet connection has several separate parts. Your computer can detect the cable and establish a local link with the router, switch, or modem while the wider internet connection is unavailable. A network icon alone does not prove that your device can reach the internet.
Do not press a recessed Reset button on your router or modem as a first step. A factory reset can erase the Wi-Fi name, password, provider settings, mesh configuration, port forwarding, and other custom settings. It will not repair a provider outage, damaged cable, defective adapter, or a disconnected service line.
Before restarting network equipment, make sure no one is relying on the connection for an internet-based home phone, medical or accessibility equipment, monitored security equipment, work, or another urgent need. Note any indicator lights before making a change.
Begin with the physical connection. Disconnect and reconnect the cable at both ends. It should click into place without force, and the retaining tab should not be broken. Look for sharp bends, crushed sections, damaged connectors, or a cable that has been stretched under furniture.
At the router or gateway, connect the computer to a numbered LAN port. Do not connect the computer to the port labeled Internet or WAN; that port normally belongs to the cable running between a separate modem and router. If the equipment combines modem and router functions in one gateway, its numbered LAN ports are still the usual computer connections.
Many routers and computers have small link/activity lights near the Ethernet port. A light can show that the cable is physically connected, but it cannot confirm that the internet is working. No light at either end is a useful clue to try another port or cable.
If the cable looks questionable or you need a different length, compare a Cat6 Ethernet cable. Match the length to your setup; an unnecessarily long cable can create clutter and extra points of failure.
Change only one item for each test. This makes the outcome meaningful.
If another device works through the same cable and port, your original computer or its Ethernet adapter is the stronger suspect. If no device works through any LAN port, check whether Wi-Fi also fails. A widespread failure points away from one computer and toward the network equipment or provider connection.
For a clean test, temporarily turn off Wi-Fi on the computer after the Ethernet cable is connected. This prevents a laptop from silently using a working wireless network while you think you are testing the wired connection. Disconnect any VPN temporarily for the test only if it is safe to do so and not required by your employer, school, or another organization.
On Windows, open Settings > Network & internet and look for Ethernet. On a Mac, open System Settings > Network and select Ethernet. The exact wording can vary by operating-system version and device manufacturer.
If the Ethernet option does not appear at all, the computer may have a disabled adapter, missing driver, damaged port, or unsupported USB adapter. Restart the computer once and inspect the connection. Do not download drivers from unfamiliar websites; use the computer maker’s or adapter maker’s official support page if an update is needed.
Most home networks use DHCP, which means the router automatically gives devices an IP address, gateway address, and DNS information. When this handoff fails, a computer may show an Ethernet connection but not know how to reach the internet.
Look at the Ethernet connection details in your computer’s network settings. If the address begins with 169.254, the computer may not have received an address from the router. That does not prove the computer is defective. It can be caused by a cable or port problem, a router that is not responding, an adapter problem, or a router configuration issue.
First, disable and re-enable the Ethernet adapter in the computer’s network settings, then reconnect the cable. If that does not help, restart the computer. Avoid entering a manual IP address unless you know your network’s correct addressing plan; an incorrect static address can create a new problem or conflict with another device.
A simple comparison gives you useful evidence:
For a broader guide to distinguishing local equipment from provider service, see How to Tell if Your Router or Internet Provider Is the Problem.
If several devices cannot reach the internet and there is no reported outage, one deliberate restart may help. For separate equipment, turn off the router and modem. Wait about 60 seconds. Restore power to the modem first and wait until it returns to its normal online state. Then power the router back on and allow it time to reconnect before testing one wired device.
With a combined modem/router gateway, restart that one device once and give it time to complete its startup sequence. Repeatedly unplugging it every minute can make diagnosis harder. For the full safe sequence, see How to Restart a Modem and Router Correctly.
Thin laptops sometimes rely on a USB-C or USB-to-Ethernet adapter rather than a built-in Ethernet jack. These adapters can fail, become loose, receive inadequate power through a dock, or simply be incompatible with a particular port. Connect the adapter directly to the computer during testing, bypassing the dock if practical. Try another USB port and confirm the computer recognizes the adapter.
Before replacing an adapter, test the cable and router port with another device. If you need one, compare a USB-to-Ethernet adapter and verify the connector type, operating-system support, and network speed your computer requires.
A router or gateway that runs unusually hot can become unstable, especially when it is enclosed in a cabinet, stacked with other equipment, or covered by papers and fabrics. Keep ventilation openings clear and place it on a stable, dry surface. Do not use equipment that is hot enough to be uncomfortable, smells burnt, shows melted plastic, has liquid damage, or has a damaged power adapter.
If your internet drops only after the router has been running for a while, heat may be one clue among several. Read Router Overheating? Causes, Fixes, and When to Replace It before deciding that replacement is necessary.
Contact the provider when multiple devices cannot reach the internet, the modem or gateway will not return to a normal online state after one deliberate restart, all LAN ports and known-good cables fail, or the provider’s status tool reports a service problem. Explain whether Wi-Fi works, whether Ethernet works, what the equipment lights show, and which cable and port tests you have already completed. Those details can help the provider decide whether to test the account, modem provisioning, signal, incoming line, or equipment.
The computer may have detected a physical link to the router or switch without receiving a usable IP address, DNS service, gateway path, or provider connection. Test another device, cable, and LAN port before changing settings.
No. On a separate modem-and-router setup, the router’s WAN or Internet port is normally reserved for the cable from the modem. Connect computers and other home devices to the numbered LAN ports.
Yes. A damaged or marginal cable can sometimes establish a link but perform unreliably or fail under use. Testing with a known-good cable is one of the most useful checks.
Not necessarily. It commonly means the device did not receive a usable address from the router. Check the cable, LAN port, router, and Ethernet adapter before assuming the computer needs repair.
Not reliably. A factory reset can erase useful settings and does not repair an outage, an incoming-line problem, a damaged cable, or a failed adapter. Use it only when earlier testing points to a configuration problem and you are prepared to set up the network again.
When Ethernet is connected but there is no internet, do not assume the router, cable, or computer is automatically at fault. Test one known-good cable, one LAN port, and one device at a time. That simple sequence separates a local wired-connection problem from a router, modem, or provider issue and helps you avoid unnecessary resets and purchases.
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