Why Wi-Fi isn't working on your computer: A complete diagnosis and fix

You turned on your laptop or PC, but suddenly lost your Wi-Fi connection—does this sound familiar? Wireless network issues on your computer can be caused by dozens of reasons, from something as simple as a disconnected adapter to complex driver conflicts. This article will help. understand it systematically, Why Wi-Fi does not work on your particular device, and will give concrete solutions for every situation.

We won't list obvious tips like "reboot your router" - instead, we'll focus on deep diagnostics taking into account the specifics Windows 10/11, MacOS and various adapter models. And if the problem turns out to be with the router, we'll teach you how to distinguish it from computer malfunctions.

Important: Troubleshooting algorithms are located in the article from simple to complexStart with the first section and check each item one by one—this will save you time and nerves.

1. Checking physical connections and basic settings

The first thing to rule out is hardware problems and obvious configuration errors. Start with a visual inspection:

• 🔌 Check if it is enabled Wi-Fi- adapter on the laptop. On some models (Lenovo, HP) there is a separate button or key combination for this (for example, Fn + F2 or Fn + F12).
• 📡 Make sure the router is plugged in and the indicator is on Wi-Fi The light is steady (not flashing red). If there is no indicator, check to see if wireless mode is disabled in the router settings.
• 🖥️ On a desktop PC: if Wi-Fi-the module is connected via PCIe or USB, reconnect it. Sometimes the contacts become oxidized or the adapter comes out of the slot.

Next, check the basic settings Windows:

1. Open Control Panel → Network and Internet → Network and Sharing Center.
2. Make sure your network is displayed in the Active Networks section. Wi-Fi- network. If there is no network, the adapter is disconnected or faulty.
3. Try turning Airplane mode on and off again (Win + A → "Airplane" button).

⚠️ Note: On some laptops Dell And Acer After updating the BIOS, the settings may be reset Wi-Fi-module. If the adapter is not detected, check the BIOS version in msinfo32.

2. Diagnose the adapter in Device Manager

If Wi-Fi It doesn't work, but the adapter is physically turned on—the problem may be with drivers or hardware conflicts. Open device Manager:

1. Click Win + X → select "Device Manager".
2. Expand the "Network adapters" branch.
3. Find the device with the names Wireless, Wi-Fi, 802.11 or model (Intel AX200, Qualcomm Atheros, Realtek RTL8821CE etc.).

Possible problems and solutions:

If the adapter is not listed, but you are sure that it is in the device, try:

• 🔄 Restart your computer with with fast startup disabled (Control Panel → Power Options → Choose what the power buttons do → Change settings → Uncheck "Turn on fast startup").
• 🔧 Reset BIOS to factory settings (remove the battery for 10 seconds or use a jumper) CLR_CMOS on the motherboard).

3. Updating and reinstalling drivers

In 60% of cases, problems with Wi-Fi On a PC, problems are related to drivers. Even if there are no errors in the Device Manager, the driver may not be working correctly. 3 ways solve this:

Method 1: Automatic update via Windows

1. In "Device Manager", right-click on the adapter → "Update driver".
2. Select "Automatic search".
3. If Windows finds an update, install it and restart your PC.

Method 2: Manual installation from the manufacturer's website

Automatic updates don't always find the latest drivers. It's best to download them manually:

• 🖥️ For built-in adapters (Intel, Qualcomm, Realtek): go to the manufacturer's website laptop (not the adapter!) and find the driver for your model.
• 🔌 For external USB adapters: download the driver from the adapter manufacturer's website (TP-Link, ASUS, D-Link).

Example for Intel AX200:

1. Download the driver from official Intel website (section "Wireless adapters").
2. Remove the old driver via the Device Manager (right-click → Uninstall device → check the box "Delete driver software").
3. Install the downloaded driver and reboot.

Method 3: Roll back the driver

If problems started after an update, revert to the old version:

1. In "Device Manager" → adapter properties → "Driver" tab.
2. Click "Roll back" (if the button is active).
3. Restart your PC.

Make sure the adapter is visible in Device Manager|

Try automatic driver update|

Download the driver from the laptop/adapter manufacturer's website|

Remove old driver before installing new one|

Restart your PC after changes-->

⚠️ Attention: On Windows 11 after updating to version 22H2 some adapters Realtek stop working. The solution is to install the driver manually from the official website, ignoring the Microsoft version.

4. Checking BIOS/UEFI settings

If Wi-Fi- the adapter isn't detected by the system at all—it may be disabled at the BIOS level. This applies to:

• 💻 Laptops after replacement Wi-Fi-module (for example, with Intel 7260 on AX210).
• 🖥️ Desktop PCs with PCIe-adapters (sometimes disabled after BIOS reset).
• 🔄 Devices after BIOS update.

How to check:

1. Restart your PC and enter the BIOS (usually the key Del, F2 or Esc when loading).
2. Find the section Advanced → Onboard Devices Configuration (the name may differ).
3. Look for parameters like:
   • Wireless LAN → should be Enabled;
   • Wi-Fi or WLAN;
   • PCIe/PCI Network Adapter (for external cards).

Save settings (F10) and reboot.

If there are no such options in the BIOS, but the adapter does not work, it may be not compatible with your motherboard. For example, some laptops Lenovo block non-original ones Wi-Fi- modules at the firmware level.

How to bypass blocking of non-original Wi-Fi modules?

On some laptops (eg. Lenovo ThinkPad) You can disable compatibility checking through a modified BIOS. However, this is risky:

1. Requires BIOS flashing from third-party developers (e.g. 1vyrain For ThinkPad).

2. Warranty may be voided.

3. Risk of bricking the device.

We recommend that you first try the original module or contact a service center.

5. Configuring network settings in Windows

If the adapter works, but Wi-Fi If it doesn't connect, there may be a problem with your network settings. Check the following:

Reset network settings

This deletes all saved networks and resets TCP/IP settings:

1. Open Settings → Network & Internet → Status.
2. Click "Network reset" → "Reset now".
3. Confirm the action and restart your PC.

Manual DNS configuration

Sometimes connection issues are caused by DNS issues. Try using public DNS from Google or Cloudflare:

1. Open Control Panel → Network and Internet → Network and Sharing Center → Change adapter settings.
2. Right click on Wi-Fi-connection → "Properties".
3. Select Internet Protocol Version 4 (TCP/IPv4) → Properties.
4. Check the box "Use the following DNS server addresses" and enter:
   • For Google: 8.8.8.8 And 8.8.4.4;
   • For Cloudflare: 1.1.1.1 And 1.0.0.1.

Click "OK" and reboot.

Checking connection restrictions

If Windows says "Connected, no internet access" or "Limited":

• 🔒 Make sure that the router is not turned on MAC address filter (your PC may be blacklisted).
• 🕒 Check if it has expired traffic limit (relevant for public networks or tariffs with restrictions).
• 🔄 Restart your router and PC simultaneously—sometimes this resets frozen sessions.

1. Open Settings → Network & Internet → Wi-Fi.

2. Click "Manage known networks" → "Add new network".

3. Enter the name (SSID) and password of your network manually.

This helps if the automatic connection is interrupted due to updates.-->

6. Software conflicts

Some programs may block Wi-Fi-compound:

• 🛡️ Antiviruses (Kaspersky, ESET, Avast) — sometimes networks are blocked as "suspicious." Check your firewall settings.
• 🔄 VPN clients (NordVPN, OpenVPN) - can redirect all traffic through a VPN, causing the regular Internet to not work.
• 🎮 Game launchers (Steam, Epic Games) - sometimes conflict with network drivers.

How to diagnose:

1. Open Task Manager (Ctrl + Shift + Esc) → "Startup" tab.
2. Disable all programs except system ones (especially VPN and antiviruses).
3. Restart your PC and check Wi-Fi.

If the problem disappears, re-enable programs one by one to find the culprit. For antivirus software, check:

• Firewall settings (permissions for network connections).
• Exceptions for Wi-Fi-adapter.
• Database updates (sometimes outdated signatures block legitimate networks).

⚠️ Attention: On Windows 10/11 built-in Windows Defender may block networks after updates. Check the "Protection History" in Windows Security for warnings about network attacks.

7. Problems on the router side

If on other devices (phone, tablet) Wi-Fi It doesn't work either—the problem is with the router. Check:

How to reset your router to factory settings:

1. Find the button on the back of the router. Reset (usually recessed into the body).
2. Press it with a pin and hold for 10-15 seconds until the indicators flash.
3. Connect to the network with the factory name (usually indicated on the sticker) and configure the router again.

If resetting doesn't help, check:

• 🔌 Is the router receiving a stable power supply (try a different power supply).
• 📡 Is it overheating (place it in a ventilated area).
• 🔄 Is the mode turned on? AP (access point) instead Router.

8. Hardware malfunctions and when to contact service

If all software methods have been tried, but Wi-Fi It still doesn't work on my computer - the problem may be hardwareSigns of malfunction:

• 💥 The adapter is not detected in any system (check on another PC or through Live USB with Linux).
• 🔥 The laptop is overheating in the area Wi-Fi-module (usually under the keyboard on the right).
• 🔌 The red indicator on the external USB adapter is flashing or it is getting hot.
• 📉 The signal disappears with the slightest movement of the laptop (problem with the antennas).

What you can do yourself:

1. For laptops:
   • Disassemble the case and check the antenna connections to Wi-Fi-module (they look like two thin wires with connectors) IPEX).
   • Clean the module contacts with an eraser (oxidation can disrupt communication).

For USB adapters:

• Try a different port (preferably USB 2.0, because USB 3.0 may cause interference).
• If the adapter gets hot, this is a sign of failure (replace it).

When to contact service:

• 🔧 If after disassembling the laptop Wi-Fi- the module is not detected (the motherboard may be damaged).
• 💻 If none of the apps on your laptop work Wi-Fi-module (problem in the connector) M.2 or food chains).
• ⚡ If the adapter sparks or smells burnt (replacement is required).

⚠️ Note: On laptops Apple MacBook (2018 and newer) Wi-FiThe modules are soldered to the motherboard. Self-repair is virtually impossible—specialized equipment is required.

FAQ: Frequently asked questions about Wi-Fi not working on a PC

Why does Wi-Fi work on my phone but not on my computer?

This means that the problem not in the router or provider, but on the computer. Check:

1. Is it included? Wi-Fi- adapter in the "Device Manager".
2. Are there any driver conflicts (try rolling back or reinstalling them).
3. Is the connection blocked by an antivirus or firewall?

If the adapter does not see the network at all, it may not support the standard. Wi-Fi 6 (802.11ax), which is enabled on the router. Try setting the router's compatibility mode in the settings. 802.11a/b/g/n/ac.

My Wi-Fi is connected, but the pages won't load. What should I do?

This is a typical problem with DNS or gatewaySolutions:

• Flush your DNS cache: Open a command prompt (Win + R → cmd) and enter:

  ipconfig /flushdns

• Check your IP settings: in the command line, run:

  ipconfig /all

  Make sure that in the lines IPv4 address, Main gateway And DNS servers the correct values ​​are indicated (not 169.254.x.x).

• Disable VPN or proxy (if using).

My Wi-Fi stopped working after a Windows update. How do I fix it?

Windows updates often break drivers. Try this:

1. Roll back the system to a restore point (Control Panel → Recovery → Open System Restore).
2. Delete last update (Settings → Update & Security → View update history → Uninstall updates).
3. Install the driver manually from the manufacturer's website (not through Windows Update).

Critical: If the problem started after an update Windows 11 before version 23H2, check the compatibility of your adapter on the Microsoft website. Some older models (Broadcom 43xx, Realtek RTL8188EE) are no longer supported.

My laptop can't see 5 GHz networks, only 2.4 GHz. Why?

This may be due to:

• Router settings (mode disabled) 5 GHz).
• Adapter limitations (older models, for example, Intel Centrino Wireless-N 1000, do not support 5 GHz).
• Regional settings (in some countries 5 GHz limited).

Solutions:

1. Go to your router settings and turn it on. 5 GHz (usually in the section Wireless → Basic Settings).
2. Update your adapter driver (sometimes manufacturers add support for it) 5 GHz in new versions).
3. Check if the router is in the "Secure Mode" mode. 2.4 GHz Only.

The Wi-Fi works, but the speed is very slow. What's wrong?

Low speed may be caused by:

Cause	Solution
Channel congestion 2.4 GHz	Switch to 5 GHz or change the channel in the router settings
Obsolete standard Wi-Fi (For example, 802.11n)	Update your adapter or router to Wi-Fi 5/6
Interference from other devices (microwaves, cordless phones)	Move your router away from sources of interference
Restriction from the provider	Check your tariff in your personal account

For diagnostics:

1. Connect to the router via cable and check the speed on speedtest.netIf the speed is low and via cable, the problem is with your provider.
2. If the speed is normal via cable, but via Wi-Fi low - check your router settings (mode 802.11ac, channel width 40/80 MHz).