Why isn't there internet on my PC via a WiFi router? A complete diagnostic guide.

Every home Wi-Fi user is familiar with the sudden loss of internet access on their computer. It can happen at the most inopportune moment: during an important video conference, downloading a large file, or watching a high-definition movie. The first step is to analyze the nature of the problem: has the connection completely disappeared, or is the icon still lit? Internet access on the taskbar, or the network is simply unstable with constant interruptions.

Often, the cause isn't a hardware failure, but a software glitch in the operating system or router that has simply frozen and stopped assigning IP addresses. The computer may see a list of available networks and even successfully connect to your access point, but it still won't start transmitting data. In this case, Windows usually displays the message "No Internet access" or "Limited", which indicates a break in the connection between the router and the provider, or a settings conflict within the local network.

Before panicking and calling your provider's technical support, it's important to run a basic diagnostic. This will save you time and possibly resolve the issue yourself in a couple of minutes. Reboot Devices often work wonders by clearing caches and reconfiguring connections from scratch, but in some cases, deeper manipulation of network settings is required.

It's important to understand that the lack of internet on your PC while Wi-Fi is working on your smartphones or tablets narrows down the problem. This means that your ISP is providing service and the router is functioning, but your computer is having trouble communicating with the router. Sometimes, an updated driver or incorrect settings are the culprit. DNS servers.

In this article, we'll detail the steps needed to identify and fix the problem. We'll cover both software solutions via the command line and Device Manager, as well as physical aspects that are often overlooked.

Diagnostics of the physical layer and router indicators

When searching for the cause, you should always begin with a visual inspection of the equipment. Go to the router and carefully examine the indicator panel. If the indicator WAN (or Internet) is off or flashing red, indicating a disconnect between the router and the ISP's equipment. In this situation, the problem isn't with your computer, but with the external line or the router's settings.

Pay attention to the wireless network indicator WLAN (or Wi-Fi). If it's not lit, the router's wireless module is either disabled by software or faulty. Check to see if the physical Wi-Fi off button on the device's body was accidentally pressed. Some models TP-Link or Asus have a separate switch that is easy to touch when cleaning.

⚠️ Attention: If the router's lights are flashing abnormally (for example, all are blinking at once, or all are off except the power light), the device may be frozen or there's a short circuit in the ports. In this case, immediately unplug the power for 10-15 seconds.

It's also worth checking the antennas, if they're removable. They should be tightly screwed in. A loose antenna connection can result in a signal being received, but the data transfer rate will be near zero, which the system interprets as a lack of internet. Make sure the ISP cable is plugged into the port. WAN, securely fixed and has no visible damage.

📊 Is the WAN/Internet indicator on the router lit?

Lights up green/blue

Flashing

It doesn't burn at all

It's red

The physical condition of the equipment is the foundation of a stable network. If the cables are damaged, or the ports are corroded or loose, no software adjustments will help restore the connection. In some cases, reconnecting the cable to an adjacent LAN port on the router can help if you're using a wired connection for diagnostics.

Checking the operation of the network card and drivers

If everything is OK with the router, we move on to the software on the computer itself. The first step is to ensure that the network adapter is enabled and functioning correctly. To do this, open device ManagerIn Windows 10 and 11, you can do this by right-clicking the Start button and selecting the appropriate option. Find the "Network adapters" section and expand it.

In the list you will see the name of your wireless module, usually containing the words Wireless, Wi-Fi or the name of the chipset (for example, Realtek, Intel, Qualcomm). If there's a yellow exclamation point or a downward-facing arrow next to the device, the driver isn't working properly or the device is disabled. If this happens, try right-clicking it and selecting "Uninstall device," then click "Action" → "Scan for hardware changes" in the menu at the top.

⚠️ Attention: Before uninstalling the driver, make sure you have access to the installation file or another device with internet access to download it if automatic reinstallation does not work.

Often, the problem lies in the power settings. The system may disable the adapter to save power, after which it fails to turn on correctly. To fix this:

• 🔋 Find your Wi-Fi adapter in Device Manager and open its properties.
• 🔋 Go to the "Power Management" tab.
• 🔋 Uncheck the box next to "Allow the computer to turn off this device to save power."
• 🔋 Save the changes and restart your computer.

It is also worth checking if it is turned on Airplane modeThis is a common but common error. The Wi-Fi icon should be lit on the taskbar (bottom right), not the airplane icon. When airplane mode is active, all wireless interfaces are blocked at the system level. You can turn it off through the notification center or with a keyboard shortcut (often Fn + F2 or a separate button on the keyboard).

Resetting network settings and command line

When the drivers are fine but there's still no internet connection, resetting network protocols often helps. Windows accumulates temporary files and the DNS cache, which can interfere with the current connection. You'll need administrator privileges to perform these operations. Open the command prompt (CMD) or PowerShell as administrator.

Enter the following commands one by one, pressing Enter after each one. This will flush the DNS cache, reset the TCP/IP stack, and update the DNS registration:

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
netsh winsock reset

After running the last command, the system will ask you to reboot. Be sure to do so. Winsock — is a programming interface that allows applications to interact with network protocols. Resetting it often solves problems where the internet seems to be working, but pages won't load in any browser.

☑️ Network Reset Checklist

Run CMD as administratorEnter the command ipconfig /flushdnsEnter the netsh winsock reset commandRestart your computer

Completed: 0 / 4

Windows 10 and 11 have a built-in network reset feature that does the same thing, but more radically. It deletes all saved Wi-Fi networks and passwords, restoring network settings to factory defaults. You can find it at: Settings → Network & Internet → Advanced network settings → Network resetUse this method if manual commands do not help.

IP address conflicts and DNS settings

One of the common reasons for lack of access is conflict IP addressesThis occurs when two devices on the same network are assigned the same address, or when a computer attempts to use a static address that is incompatible with the router's current network. Ideally, these settings should be obtained automatically.

You can check and change the settings through the control panel. Go to Control Panel → Network and Internet → Network and Sharing CenterClick on the name of your connection (Wireless Network), then the Properties button. Find the line in the list Internet Protocol version 4 (TCP/IPv4), select it and click "Properties".

Make sure the following items are selected:

• 📍 Obtain an IP address automatically.
• 📍 Obtain DNS server address automatically.

If you have static DNS registered (for example, from Google 8.8.8.8 or Yandex 77.88.8.8), try switching to automatic DNS or, conversely, manually entering public DNS if your provider's DNS is unstable. DNS errors can cause websites to not open by name, although instant messaging apps may work.

How to find out your router IP address?

The default gateway address is usually listed on a sticker on the bottom of the router. Most often, it's 192.168.0.1 or 192.168.1.1. You can also find it using the ipconfig command in the command prompt (see the "Default gateway" line).

Sometimes your antivirus or firewall may block the connection, considering the network public and unsafe. Check your antivirus settings (Kaspersky, ESET, Avast) and temporarily disable the built-in Windows firewall to test. If the internet connection appears, you need to add your home network to the list of trusted networks.

Comparison of popular problems and solutions

To make diagnostics easier, we've compiled a table to help you quickly navigate the symptoms and possible solutions. Different symptoms indicate different levels of malfunction.

Symptom	Probable cause	Solution method
No Internet Access Icon	DNS or router problem	Reset DNS and reboot the router
The computer does not see any networks.	The adapter or driver is disabled	Checking Device Manager
There is a connection, but the pages are not loading.	Blocked by antivirus	Checking firewall settings
The network is only on the phone	IP conflict or MAC filtering	Resetting your PC's network settings
Constant connection breaks	Interference or weak signal	Changing the Wi-Fi channel, relocating the router

Analyzing the table, you can see that most problems can be resolved using software. However, if the symptoms indicate a physical malfunction (for example, the computer doesn't respond to Wi-Fi networks at all, even though everything works on other devices), it's worth considering a replacement. USB Wi-Fi adapter or contacting a laptop service center.

Keep in mind that overheating network equipment can also cause instability. If the router or USB dongle is hot to the touch, allow them to cool. Critical overheating of the wireless chip can lead to complete failure of the module before it cools down.

Frequently Asked Questions (FAQ)

Why is there internet on my phone, but not on my PC via Wi-Fi?

Most likely, the problem lies with the computer's settings. This could be an incorrectly configured static IP address, an outdated Wi-Fi adapter driver, or a blocking issue with antivirus software. The router may also have blocked the device by MAC address in the parental controls settings.

How do I know if the problem is with my ISP or my router?

Check the WAN/Internet indicator on your router. If it's lit, but the internet isn't working on any devices (including phones), the problem is likely with your ISP or authentication settings (PPPoE, L2TP). If the internet works on your phones but not on your PC, the problem is with your computer.

Can a virus disable the Internet on a computer?

Yes, some types of malware change proxy or DNS settings, redirecting or blocking traffic. Scan your system with an antivirus and reset your network settings using the command netsh winsock reset.

What should I do if Wi-Fi disappears after a Windows update?

Updates often break compatibility with older drivers. Go to Device Manager, uninstall the wireless adapter driver, and reboot. Windows will attempt to install the default driver. If that doesn't work, download the latest driver from the laptop manufacturer's website using a different device.

Will resetting the router to factory settings help?

Yes, this is a radical method that eliminates all software errors in the router. However, after resetting (using the Reset button), you'll have to reconfigure your internet connection (enter your ISP username and password) and set a Wi-Fi network name and password.