Why Wi-Fi isn't working: A complete diagnosis and ways to restore internet service

You turned on your laptop, smartphone or TV, and the Internet is through Wi-Fi Has it suddenly stopped working? The signal is lost, the page won't load, and the router is flashing strange lights—a situation familiar to many. There are many reasons why Wi-Fi There could be dozens of reasons why something isn't working: from a simple power outage to complex equipment malfunctions. But in 90% of cases, the problem can be solved independently in 5-15 minutes if you know where to look And what to check.

This article is not just a list of tips, but step-by-step diagnostic algorithm, which will help identify the root of the problem. We'll figure out how to distinguish between a provider-side failure and a router malfunction, why one device connects to the network while another doesn't, and what to do if Wi-Fi there are, but the pages don't open. You will also find out which Router settings are most often reset after a firmware update. and how to restore them without calling a specialist.

Before you call support or rush to the store for a new router, run through our checklist. Chances are, the solution will be simpler than you think!

1. Check the obvious: power, cables and indicators

Start with a basic diagnosis—often the problem lies in small, easily overlooked details. The first thing to do is:

• 🔌 Make sure the router is plugged into a power outlet.. Check if at least one indicator is lit (usually a light bulb) Power). If not, try a different outlet or check the power supply (sometimes it burns out).
• 🌐 Check the cable from your provider.It should be firmly inserted into the port. WAN (or Internet) on the router. If the cable is damaged (pinched, frayed), the signal will be interrupted.
• 📡 Check the indicators on your routerNormal operation usually looks like this:
  • Power — lights up green/blue;
  • Wi-Fi — blinks or lights up constantly;
  • Internet (or WAN) - lights up green (if it's red or not lit, the problem is on the provider's side).

If the indicator Internet is not active, and the others are on - most likely, the problem is with the Internet provider. Try rebooting your router (Unplug it from the outlet for 30 seconds and plug it back in.) If the indicator doesn't light up after this, call support.

⚠️ AttentionIf after a thunderstorm or power surge the router doesn't turn on at all (no indicators, no heat), the power supply or the board itself is likely burned out. In this case, self-repair is not recommended—contact a service center.

2. The problem is on the provider's side: how to check

If the router is turned on, the cables are in place, but the indicator Internet If it's not lit or flashing red, it's your ISP's fault. Here's how to confirm:

• 📞 Call supportAsk if there are any outages on your line. Check if your internet connection is paid for (sometimes access is blocked for non-payment).
• 🔧 Connect the ISP cable directly to the computer (to the port Ethernet). If the internet works, the problem is with the router. If not, the ISP is to blame.
• 🌍 Check your connection status on your provider's website.Many companies (for example, Rostelecom, Beeline, MTS) there is a personal account where accidents are displayed.

If your provider has confirmed that everything is fine on their end, but the internet still doesn't work, proceed to the next step.

⚠️ Attention: If you are connected via technology PPPoE (requires login and password), make sure the information is entered correctly. After resetting the router, these settings are lost, and the internet will not work, even if the cable is connected.

3. There is Wi-Fi, but the Internet does not work: device diagnostics

Situation: Network Wi-Fi The device connects, but the pages don't load, and there's an exclamation mark next to the Wi-Fi icon. There could be several reasons:

• 🔄 DNS failureServers that translate website addresses into IP addresses may be unavailable.
• 🛡️ Blocked by antivirus/firewallSometimes security programs block network access.
• 📱 IP address problemsThe device does not receive the correct address from the router.

How to check:

1. Restart your device (laptop, smartphone, TV). Sometimes this solves network settings issues.
2. Try opening the site by IPFor example, instead of google.com enter in the address bar 8.8.8.8If the page opens, DNS is to blame.
3. Disable your antivirus/firewall for 5 minutes and check the connection.
4. Reset network settings:
   • On Windows: Start → Settings → Network & Internet → Network reset.
   • On Android: Settings → System → Reset → Reset Wi-Fi, Mobile Data, and Bluetooth.

If the problem only affects one device, while the others are working fine, the device's settings are to blame. If the internet doesn't work on all devices, the problem lies with the router or ISP.

Try opening the website by IP (for example, 8.8.8.8)|Disable your antivirus/firewall|Reset network settings on your device|Reboot your router|Check your DNS settings in your router-->

4. The router distributes Wi-Fi, but the internet connection drops out periodically.

If the connection drops every few minutes or the speed drops sharply, this is a sign of an unstable connection. Possible causes:

• 📶 Weak signalIf the router is located far away or there is interference (walls, microwave oven, neighboring networks), the connection will be interrupted.
• 🔄 Channel congestionIf many devices are connected to the router (especially torrent clients or online games), speed may drop.
• 🔌 Router malfunctionOverheating, an old power supply, or a firmware failure can cause freezes.
• 📡 Interference from other networksIf there are many routers on the same channel, they can jam each other.

How to fix:

1. Check your network loadDisconnect all devices except one and see if the connection is stable. If so, the problem is overload.
2. Change Wi-Fi channelGo to your router settings (192.168.0.1 or 192.168.1.1) and in the section Wi-Fi select a channel 1, 6 or 11 (they intersect the least).
3. Update your router firmwareOutdated software can cause problems. Download the latest version from the manufacturer's website (e.g. TP-Link, ASUS, Keenetic).
4. Check the router temperatureIf the case is hot, let it cool (place it in an open area, do not cover it).

If the disconnections continue, try connecting to the router via cable. If via Ethernet the internet is stable, but Wi-Fi — No, the problem is in the router’s wireless module.

How do I know which Wi-Fi channel is free?

To find the least congested channel, use network analysis applications, such as WiFi Analyzer (Android) or NetSpot (Windows/macOS). They'll show you which channels neighboring routers are using and help you choose the best one.

5. The device does not see the Wi-Fi network or does not connect

If your smartphone, laptop or TV can't find the network Wi-Fi or cannot connect to it, the reasons may be the following:

• 🔇 The network is hidden. The mode may be enabled in the router settings. Hide SSID (hiding the network name).
• 🔒 Incorrect passwordIf you recently changed your Wi-Fi password, your device won't connect using the old password.
• 📵 Incompatibility of standards. Old devices (eg. iPhone 4 or Samsung Galaxy S3) do not support modern standards Wi-Fi 6.
• 🛠️ Driver errorThe Wi-Fi adapter driver on your PC may be damaged.

How to solve:

1. Make sure the network is not hiddenGo to your router settings and check the parameter. Hide SSID (must be Disabled).
2. Check your passwordTry connecting from a different device. If that doesn't work, reset the password in your router settings.
3. Change Wi-Fi standardFind the parameter in your router settings. Wireless Mode and select 802.11n (supported by most devices).
4. Update your Wi-Fi driver (for PC):
   • Click Win + X → device Manager.
   • Find Network adapters → your Wi-Fi-module.
   • Right click → Update driver.

If the device still does not see the network, try connecting to another one Wi-Fi (for example, to a mobile hotspot). If it doesn't work there either, the problem is with the device itself.

6. Resetting the router to factory settings: when is it necessary?

If none of the above helps, the last chance before contacting the service is full reset of the routerThis will reset all settings to factory defaults and often resolves issues caused by:

• ⚙️ Incorrect settings (for example, after experimenting with DMZ or Port Forwarding);
• 🔄 Firmware failure;
• 🔒 Forgotten password for the admin panel.

How to reset a router:

1. Find the small button on the back of the router. Reset (usually recessed into the body).
2. Take a paper clip or a toothpick and press and hold the button 10-15 seconds (until the indicators blink).
3. After rebooting, the router will be like new - with the factory network name (usually TP-Link_XXXX, Keenetic-XXXX) and password (indicated on the sticker).

After the reset, you need to reconfigure your Internet connection (enter your provider data) and configure Wi-Fi (network name, password). Instructions are usually available on the router manufacturer's website.

⚠️ Attention: Reset deletes All settings, including PPPoE-logins, MAC filters And guest networksIf you don't remember your provider's connection details, check them in advance in your personal account or with support.

7. When you can't do without a mechanic: signs of serious problems

If you've tried everything but Wi-Fi still not working, maybe the problem is hardware failureContact the service center if:

• 🔥 The router won't turn on (no indicators, no heat) - most likely, the power supply or motherboard has burned out.
• 📡 Network Wi-Fi It's not visible on any device, even though the router is working and distributing internet via cable—the wireless module is faulty.
• 🔌 The Internet connection drops even when the ISP cable is directly connected to the PC. The problem is with the line or the ISP equipment.
• 🔄 The router constantly reboots or freezes - this may be a sign of capacitor failure or chip overheating.

The cost of router repair depends on the breakdown:

If the router is older than 5 years, repairing it may not be cost-effective - it is easier to buy a new one (for example, TP-Link Archer C6 or Xiaomi Mi Router 4A for 2000–3000 ₽).

FAQ: Frequently asked questions about Wi-Fi not working

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

This is a typical situation where the problem lies in the settings of a specific device. Check:

• Is it included? Wi-Fi- adapter on the laptop (sometimes it is turned off by a button or in Device Manager).
• Are the network card drivers updated?
• Is your antivirus or firewall blocking access?
• Is there a limitation in the router settings? MAC address (sometimes the laptop may be blacklisted).

Also try "forgetting" the network on your laptop and reconnecting.

📵 What should I do if my router isn't distributing Wi-Fi after a firmware update?

Updating your firmware may reset your settings or cause a conflict. Try:

1. Reset the router to factory settings (button Reset).
2. Roll back the firmware to the previous version (if there is a backup copy).
3. Check the manufacturer's website to see if the latest firmware version contains any bugs.

If after reset Wi-Fi If it doesn't work, try flashing the router manually again (instructions are available on the websites) TP-Link, ASUS and others).

🔌 Could the problem be with the cable from the provider?

Yes, and this is one of the most common reasons. Check:

• Is the cable firmly inserted into the port? WAN router.
• Is there any physical damage (kinks, breaks in the braid)?
• Does the Internet work if I connect the cable directly to the PC?

If the cable is damaged, replace it (costs 100–300 ₽). If the problem is with your provider's line, call support.

🛡️ Why is Wi-Fi working, but some websites won't open?

This may be due to:

• DNS serversTry changing them to 8.8.8.8 (Google) or 1.1.1.1 (Cloudflare).
• Blocking the providerSome websites may be blocked by law (for example, torrents).
• Router settings. Check if it is turned on. Parental Control or Website filtering.

Also try opening the site through VPN - If it works, the problem is in the blocking.

📡 How to boost a weak Wi-Fi signal?

If there is a network, but the signal is weak (1-2 bars), try:

• Move the router to the center of the apartment (away from walls and furniture).
• Change the channel Wi-Fi to a less busy one (1, 6 or 11).
• Update the router firmware.
• Buy repeater (signal amplifier) ​​or Mesh system (for large spaces).
• Replace the router antennas with more powerful ones (if they are removable).

Also check if the router is located near sources of interference, such as microwaves, cordless phones, or other routers.