Why Wi-Fi on my laptop stopped working: diagnostics and repair

You turned on your laptop, but suddenly the internet connection went down—the Wi-Fi icon has a red cross through it, no networks are displayed, or the connection keeps dropping. This situation is familiar to many, but the causes can range from simple settings to serious hardware issues. In this article, we'll look into it. all possible scenarios, Why Wi-Fi stopped working on a laptop running Windows 10/11, macOS or Linux, and we will also give step-by-step instructions troubleshooting - from checking the router to replacing the network card.

Important: If the problem occurred after a system update, a laptop crash, or connecting to a new network, this narrows down the possible causes. We've compiled universal diagnostic scheme, which will help you identify the root of the problem in 10-15 minutes, even if you're not a tech savvy user. We'll start with the simplest and end with solutions for experienced users.

1. Checking the router and external factors

Before messing with your laptop's settings, make sure the problem isn't with your router or ISP. Check your other devices (smartphone, tablet, second laptop): if they also can't connect to Wi-Fi, the problem is definitely not with your device.

What to do:

• 🔄 Reboot your router: Unplug the power supply for 30 seconds, then plug it back in. Wait for it to fully boot up (usually 1-2 minutes).
• 📡 Check the indicators on the router: if the light is on Wi-Fi does not light up or flashes red, the wireless module may be disabled (press the button WPS/Wi-Fi on the body).
• 📶 Make sure the network is not hidden: in the router settings (192.168.0.1 or 192.168.1.1) check that the option Hide SSID disabled.
• 🔌 Connect your laptop to the router with a cable: if the internet works Ethernet, but not via Wi-Fi, the problem is definitely in the wireless module.

⚠️ Attention: If the router gives an error No Internet (yellow triangle on the network icon), contact your provider - there may be problems on their end or re-authorization is required (for example, after changing your tariff).

2. Diagnosing the network adapter in Windows

If the router is working and other devices are connecting to the network, we move on to checking the laptop. Windows Most Wi-Fi problems are related to the drivers or settings of the network adapter.

Step 1: Checking the adapter status:

1. Click Win + R, enter ncpa.cpl and press Enter.
2. Find the adapter Wi-Fi (may be called Wireless network or Wireless).
3. If the icon is grey, right-click and select Turn on.

Step 2: Troubleshooting:

• Right-click on the network icon in the tray → Troubleshooting.
• Follow the wizard's instructions. If the system prompts you to reset settings or update drivers, agree.

Step 3: Checking Drivers:

1. Click Win + X → device Manager.
2. Expand the tab Network adapters.
3. Find the device with the names Wi-Fi, Wireless, 802.11 (For example, Intel Wi-Fi 6 AX200 or Qualcomm Atheros QCA61x4).
4. If there's a yellow triangle next to it, the driver isn't working properly. Right-click → Update driver → Automatic search.

⚠️ Attention: If after updating the driver Wi-Fi has disappeared completely, roll it back: in Device Manager select Properties → Roll back the driverIf the option is inactive, download the driver from the laptop manufacturer's website (section Support).

Check for a yellow triangle in Device Manager.

Update the driver via Windows Update

Download the latest version from the manufacturer's website (not from torrents!)

Restart your laptop after installation-->

3. Hardware reasons: from antennas to the Wi-Fi module

If software methods do not help, the problem may be in physical damage laptop components. The most common ones affected are:

• 📡 Wi-Fi antennas — thin wires running from the network card to the case. They can become disconnected when the laptop is dropped or disassembled.
• 🔌 Network card — a module responsible for wireless communication. In budget laptops, it is often soldered to the motherboard, while in premium models it is removable (format M.2 2230).
• ⚡ Contact — oxidation or contamination of connectors after exposure to moisture.

How to check:

1. External examinationIf your laptop has been disassembled or dropped, inspect the antennas (they are attached to the screen cover). Damage to them is a common cause of Wi-Fi loss.
2. Test on another device: remove the Wi-Fi module (if it is removable) and connect it to another laptop via an adapter M.2 → USB.
3. Checking via Linux Live USB: boot from flash drive with Ubuntu - If Wi-Fi works, the problem is Windows.

4. BIOS and power saving settings

Sometimes Wi-Fi disconnects due to incorrect BIOS settings or power saving mode, which blocks the network adapter to save battery power.

BIOS Check:

1. Restart your laptop and enter the BIOS (usually the keys F2, Del or Esc when loading).
2. Find the section Advanced → Wireless or Onboard Devices.
3. Make sure the options are Wi-Fi, WLAN or Wireless LAN included (Enabled).

Power saving settings in Windows:

1. Open Control Panel → Power Options.
2. Click Setting up a power plan → Change advanced settings.
3. Find Wireless Network Adapter Settings → Power saving mode.
4. Install Maximum performance for both options (battery and mains).

5. Program conflicts and viruses

Some programs (especially VPN clients, antiviruses And network managers) can block Wi-Fi or change connection settings. Viruses also sometimes modify network settings, making it impossible to connect to the internet.

What to do:

• 🛡️ Disable your antivirus temporarily and check if the network comes back online. Common culprits: Kaspersky, Avast, ESET NOD32.
• 🔗 Remove VPN: programs like NordVPN, ProtonVPN or built-in Windows VPN may conflict with Wi-Fi.
• 🦠 Check your system for viruses by using Malwarebytes or Dr.Web CureIt.
• 🔄 Reset the network: V Windows 11 go to Settings → Network & Internet → Network reset.

If the problem appeared after installing a specific program, try restore the system to the previous point:

1. Click Win + R, enter rstrui.
2. Select a restore point 1-2 days before the problem occurred.

6. Problems with macOS (for Apple laptops)

On MacBook The reasons for Wi-Fi loss are often related to system updates, SMC failures (system control controller) or incorrect network settings.

Basic steps:

• 🔄 Restart your MacBook - Sometimes this solves the problem.
• 📡 Delete network settings:
  1. Open System Preferences → Network.
  2. Select Wi-Fi → click − (minus) to delete.
  3. Add the network again by clicking +.

Turn off your MacBook → Hold down Shift + Control + Option + Power button for 10 seconds → Turn on.

For MacBook on Apple Silicon (M1/M2):

• Resetting the SMC is not required - instead, perform reset network settings:

  Open Terminal → Enter:
  sudo ifconfig en0 down
  sudo ifconfig en0 up

• If it doesn't help, create a new user in System Preferences → Users & Groups and check the Wi-Fi underneath it.

⚠️ Note: On MacBooks with chips M1/M2 Wi-Fi problems are sometimes only resolved after an update macOS to the latest version. Check for updates in System Settings → Software Update.

7. When to contact the service center

If you've tried all the methods and your Wi-Fi still isn't working, the problem is most likely hardwareContact the service center if:

• 🔧 The laptop was dropped or exposed to moisture.
• 🔌 The Wi-Fi module is not detected in Device Manager (even after reinstalling the drivers).
• 📡 Antennas are physically damaged (visible during disassembly).
• ⚡ The problem appeared after repairing the motherboard.

Repair cost (approximate):

Type of malfunction	Price (rubles)	Term
Replacing the Wi-Fi module	1 500–3 000	1–2 days
Soldering work (antennas, contacts)	2 000–5 000	2–5 days
Diagnostics + BIOS reflashing	1 000–2 500	Day 1

Before visiting the service center make a backup copy of your data - Sometimes a complete system reset is required for repairs.

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

❓ Why doesn't my laptop see only my network, but it does see others?

Your router is probably in the mode 802.11ac (5 GHz), and the laptop only supports 802.11n (2.4 GHz). Go to your router settings and enable support. 2.4 GHz or update your Wi-Fi adapter driver.

❓ My Wi-Fi is connected, but I can't access the internet. What should I do?

Check your settings DNS:

1. Open Control Panel → Network and Internet → Network and Sharing Center.
2. Click on your network → Properties → Internet Protocol version 4 (TCP/IPv4).
3. Install Obtain DNS server automatically or enter manually 8.8.8.8 (Google) and 8.8.4.4.

Also try disabling the proxy: Settings → Network & Internet → Proxy → turn off all options.

❓ Is it possible to connect an external Wi-Fi adapter via USB?

Yes, this is a temporary solution if the built-in module is broken. Any adapter that supports it will work. 802.11ac (For example, TP-Link TL-WN823N or ASUS USB-AC56). Connect it to a USB port and install the drivers from the official website.

❓ My Wi-Fi disappeared after a Windows update. How can I get it back?
The new update is likely incompatible with your driver. Roll it back:
1. Settings → Update & Security → View update history.
2. Find the latest update (usually with a code KBxxxxxxx) → Delete.
3. Block it from being installed again using a utility wushowhide from Microsoft.
❓ My laptop connects to Wi-Fi, but the speed is very slow. What's wrong?

The reasons may be different:

• The router is overloaded (reboot it).
• The laptop is far from the router or walls are interfering with the signal (try changing the channel in the router settings to 1, 6 or 11 for 2.4 GHz).
• The Wi-Fi driver is out of date (update it manually from the manufacturer's website).
• There are many devices on the network - limit their number or configure QoS in the router.