How to Check if Your Wi-Fi Adapter is Working: Complete Instructions for All Devices

Have you suddenly lost internet access, and a cross or exclamation mark appears next to the Wi-Fi icon in the system tray? The first thing that comes to mind is a problem with your router or ISP. But often, the root cause lies in the device itself: The Wi-Fi adapter may have been disabled by software, failed, or conflicted with drivers.Before calling support or rushing out to buy a new router, it's worth making sure the problem isn't on your end.

In this article we will look at All possible ways to check a Wi-Fi adapter — from basic (reboot and physical inspection) to advanced (command line diagnostics and system log analysis). The instructions are suitable for Windows 10/11, macOS, Linux, as well as for built-in and external USB adapters. You'll learn how to determine whether the adapter is to blame for the lack of network connection, and what to do if it truly isn't working.

1. Physically checking the adapter: what can be done without software

Start with the simplest thing - Make sure the adapter is physically intact and connected.This step is often overlooked, although it helps identify obvious problems in seconds.

• 🔌 For laptops: Locate the Wi-Fi switch on the case (usually on the side or front panel) and make sure it is turned on. On some models Lenovo, HP or Dell This could be a slider or a button with an indicator.
• 💡 For PC with external USB adapter: Check if the LED on the device is lit. If not, try reconnecting it to a different port or replacing the cable (if it's detachable).
• 🔍 For built-in adapters (M.2/PCIe): If you have recently disassembled your system unit, make sure that the antennas are connected to the connectors on the board (usually MAIN And AUX).

If the adapter is external (for example, TP-Link TL-WN725N or ASUS USB-AC56), try connecting it to another device—a smartphone via OTG or a second computer. If Wi-Fi works, the problem lies with the ports or settings on your PC.

⚠️ Attention: On some laptops (especially Acer And MSI) Wi-Fi can be turned off by pressing a key combination, for example Fn + F2 or Fn + F12Check the keystrokes or the user manual for hints.

2. Checking via Device Manager (Windows)

If everything is physically in order, we move on to software diagnostics. Windows The fastest way to check the adapter's status is to look into device Manager.

1. Click Win + X and select device Manager.
2. Expand the section Network adapters.
3. Look for devices with names like Wireless, Wi-Fi, 802.11 or the model of your adapter (for example, Intel Wi-Fi 6 AX200, Qualcomm Atheros QCA9377).

Please note the icons next to the name:

• ⚠️ Yellow triangle with an exclamation mark — the adapter does not work properly (usually due to drivers).
• ↓ Down arrow — the device is disabled.
• 🔴 Red cross — the adapter is not detected or disabled in BIOS.

If the adapter is disabled, right-click on it and select EngageIf there is an error, try updating the driver (more on this in the next section).

3. Diagnostics via command line (CMD)

The command line allows you to get detailed information about the adapter and network status. Open CMD as administrator (Win + X → Terminal (Administrator)) and run the following commands:

netsh wlan show drivers

This command will show driver status and supported standards (eg 802.11n, 802.11ac). Pay attention to the lines:

• Radio type — it should be 802.11n or higher.
• Hosted network support — Yes (if you are using an access point).

netsh wlan show interfaces

Displayed here current connection status:

• State — it should be Connected or Disabled (if you are not connected to the network).
• SSID — the name of your network.
• Radio type - if this is empty, the adapter does not detect the network.

If the command returns an error No wireless interfaces, this means that Windows doesn't see the adapter at all - the problem may be in the drivers, BIOS, or hardware failure..

4. Check on macOS: "System Profiler" and "Wireless Network Diagnostics"

On MacBook or iMac Diagnosing your Wi-Fi adapter is a little easier thanks to built-in utilities. Here's what you need to do:

1. Open Apple Menu → About This Mac → System Profiler → Networks → Wi-Fi.
2. Check the lines:
   • State — it should be Connected.
   • Interface - usually en0 or en1.
   • PHY Mode - For example, 802.11ac.

If the adapter is not displayed or shows Disabled, try resetting SMC (For Mac with a processor Intel):

sudo shutdown -r now

(For Apple Silicon a simple reboot is enough.)

For in-depth diagnostics, use the built-in utility: Option (Alt) + click the Wi-Fi icon → Open Wireless Diagnostics.

The program will automatically scan the network and generate a report with possible problems.

⚠️ Attention: On macOS Monterey and newer, some Wi-Fi settings may be hidden due to security policy AppleIf the adapter is not detected, try updating the system or resetting the network settings via System Preferences → Network.

5. Diagnostics in Linux: commands iwconfig, lspci And dmesg

IN Linux (For example, Ubuntu, Debian or Fedora) The Wi-Fi adapter is checked through the terminal. Open it (Ctrl + Alt + T) and run:

iwconfig

Look for the section with the name of your adapter (usually wlan0, wlp3s0). If it is not there or written no wireless extensions, adapter not found.

lspci | grep -i network

This command will show all network devices, including Wi-Fi. Example output:

03:00.0 Network controller: Intel Corporation Wi-Fi 6 AX200 (rev 1a)

If the line is missing, the adapter is not recognized by the system.

dmesg | grep -i wifi

Shows download log with Wi-Fi related errors. Look for lines with firmware, failed or error.

If the adapter is detected but not working, try restarting the network service:

sudo systemctl restart NetworkManager

What to do if rfkill list shows Hard blocked

yes?:This means that the adapter is locked by hardware - usually by a button on the laptop case or in the BIOS. On some models (for example, Lenovo ThinkPad) the lock is removed by a combination Fn + F8 or through BIOS settings (Wireless → Wireless LAN → Enabled).

6. Checking drivers: updating, rolling back, and manual installation

IN 90% of cases Wi-Fi adapter problems are related to drivers. Even if in Device Manager There are no errors, the driver could be outdated or conflict with the system.

How to update the driver automatically:

1. Open device Manager.
2. Find your Wi-Fi adapter, right-click → Update driver → Automatic search.

If Windows does not find updates, download the driver from the manufacturer's website (for example, for Intel — support.intel.ru, For Realtek — realtek.com).

How to roll back a driver (if problems started after an update):

1. IN Device Manager click on the adapter → Properties → Driver → Roll Back Driver.
2. If the button is inactive, uninstall the driver and restart your PC - Windows will install the previous version automatically.

Manual driver installation (for advanced users):

1. Download the driver from the official website (for example, for Broadcom or Mediatek).
2. IN Device Manager select Update Driver → Browse my computer for driver software.
3. Specify the path to the downloaded file (usually this is a folder with the extension .inf).

⚠️ Attention: Never download drivers from third-party websites (for example, driverpack.io or drp.su). They often contain viruses or outdated versions. Use only official sources or Windows Update.

7. Alternative testing methods: from BIOS to test software

If all the previous steps did not help, try these methods:

• 🔧 Checking in BIOS/UEFI:
  1. Restart your PC and enter BIOS (usually Del, F2 or Esc when loading).
  2. Find the section Advanced → Onboard Devices or Wireless.
  3. Make sure that Wi-Fi or WLAN included (Enabled).
4. 📊 Test software: Utilities like Wi-Fi Analyzer (Android) or inSSIDer (Windows) will show whether the adapter detects networks. If the list of networks is empty, the problem is with the adapter.
5. 🔄 Network reset: In Windows: Settings → Network & Internet → Network resetOn . macOS: delete the file /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist and reboot.
6. 🛠️ Check on another device: If the adapter is external (USB or PCIe), connect it to another PC. If the problem persists, the adapter is faulty.

If the adapter doesn't work on any device, it's most likely out of orderIn this case, the only option left is to replace it. For laptops, this could be the integrated board (for example, Intel AX201), for PC - USB or PCIe adapter (for example, TP-Link Archer T4E).

FAQ: Frequently asked questions about testing your Wi-Fi adapter

My adapter isn't showing up in Device Manager. What should I do?

If the adapter is completely missing from the list, it may mean:

• It is disabled in BIOS (check settings as described above).
• The driver is not installed (download it from the laptop or adapter manufacturer's website).
• The adapter is physically damaged (for example, contacts on the PCIe card have come loose).

For laptops, try resetting EC/BIOS (remove the battery and turn off the power for 30 seconds).

The Wi-Fi works, but it keeps dropping out. What's wrong?
Reasons for an unstable connection:
• Outdated driver (please update it).
• There's a conflict with other devices (e.g. Bluetooth). Disable them temporarily.
• Interference from other networks (change the channel on the router in the settings) 2.4 GHz/5 GHz).
• Energy Saver: Disable the option in Windows Allow the computer to turn off this device to save power in the adapter properties.
Is it possible to test the adapter without an internet connection?
Yes, most methods (eg. iwconfig in Linux or netsh wlan show drivers (in Windows) work offline. You can also:
• View a list of available networks (even without a connection).
• Check the adapter status in Device Manager.
• Use diagnostic utilities (eg Wi-Fi Diagnostics on macOS).
How do you know if the adapter is burned out?

Signs of hardware failure:

• The adapter is not detected on any device.
• There is no indicator on the USB adapter body (if there was one previously).
• The system is experiencing errors of the type Device cannot start (Code 10) even after reinstalling the drivers.
• Physical damage (melted contacts, burning smell).

In this case, the only option left is replacement.

Do I need to update the driver if Wi-Fi is working fine?
Not required, but recommended if:
• You have noticed a decrease in speed or stability.
• The manufacturer has released an update with fixes for vulnerabilities (for example, for Intel Wi-Fi 6).
• You have updated Windows to a new version (sometimes new drivers are required for compatibility).

If the system is stable, it is better not to touch the running drivers.