Routers and access points with Wi-Fi are an essential attribute of the home and mobile internet it's been 10 years now. Once the speed of the Wi-Fi network can be greatly reduced, and sometimes the wireless connection disappears completely and for a long time.

The main causes of disruption of the Wi-Fi network

Problems with wireless Internet access can be due to various reasons: router failures, wrong settings computer or smartphone, interference from nearby equipment, etc. Viruses and even hackers can disrupt the operation. In all cases, you need to identify the cause of the malfunction and try to eliminate it - first on your own, and if it doesn’t work out, then by contacting professional computer scientists.

Wi-Fi network is visible to devices, but they do not connect to it

There are several reasons why there may not be a connection to a Wi-Fi network.

Wi-Fi network not visible to devices

The reasons why wifi network not visible from the gadget or PC, a few.

Wi-Fi on PC or tablet not working after reinstalling Windows

There are several reasons - from hardware to software.

Video: Wi-Fi not working after Windows 10 update

Laptop or tablet is connected to Wi-Fi, but there is no Internet

The reasons are related to the fact that there is no Internet access on the router.

Internet via Wi-Fi is available, but turns off by itself

There may also be several reasons.

Poor internet connection quality. If the provider has an unreliable communication channel or, in the battle for the first place in the list of the most popular operators, it went too far with the number of clients, the speed of individual users will be very low, the connection will often reconnect due to equipment overload, and incoming traffic will hang. Previously, cellular providers suffered from this - at the initial stages of development of the 2G / 3G / 4G coverage area, demand in the conditions of a precipitous decline in the price of 1 MB of traffic was far ahead of the construction and launch of new network facilities.
hangup random access memory router (data buffer overload). Restarting it will help.
The device has overheated - in any modern technology there is protection against overheating of the chips. Both the CPU / RAM of the router or access point, as well as any of its microcontrollers that process incoming / outgoing via LAN or wifi data. It is advisable to turn off the router for at least a few minutes.

When bad signal 3G / 4G and high Internet speed, the 4G modem used with the router can also overheat at the same time. Users of Android smartphones and tablets (Yota subscribers), who distributed up to 40 GB every day via Wi-Fi (in the 2000s, these were Nokia and Motorola mobile phones connected via cable or Bluetooth), talk about cases when the device heated up like a kettle and disconnected every hour or two downloading / distributing torrents on a PC. The same thing happens with routers.

Wi-Fi not working due to firmware glitches and viruses

No matter how simple, friendly and secure the firmware (firmware) of the router is, the router itself is not protected from malfunctions and viruses. Viral technologies disrupted Apple, Android and Symbian gadgets. The virus code penetrated into ATMs, ATMs and access control systems at protected facilities with the Internet, disabled the firmware in USB modems. Routers are not insured either - neither purely wireless ones from Beeline or Yota, nor home ZyXEL and TP-Link, nor Cisco access points, nor purely cable equipment used at facilities where any wireless element is prohibited by security rules.

Crashes in software can arise both due to inept flashing (through ignorance or accident, the power is reset at the time of updating the firmware in the flash memory of the router), and the wear of the flash memory chip itself (it is even impossible to enter the router settings - underloading of the web interface pages in the browser) .

Virus activity is expressed in reprogramming the router settings: changing IP DNS to the values of a malicious server, substituting primitive passwords or turning off Wi-Fi security settings, switching wired protocols and cellular networks, etc. To fix this, do the following.

Sometimes a virus changes the firmware file just before it is loaded into the router. The solution is to remove viruses from the PC, using all means up to formatting the drive (of course, transferring valuable data to other media before that) and download official version firmware again from the manufacturer's website.

Slow internet speed over Wi-Fi

The reasons are related both to the quality of network access and to the Wi-Fi connection parameters.

Low speed cable or cellular provider at the rate. If the speed of Rostelecom and its dealers is not limited, then in cellular networks, for example, in MegaFon or MTS, after a certain number of gigabytes of traffic per month, the speed drops to 64 (or 128) kbps. Change tariff and provider.
MTS limits the connection speed on the Hype tariff after the subscriber uses up 7 GB of mobile traffic per month
Unstable operation of LAN-Ethernet 10/100 networks. You can feel how the speed, due to the damaged cable of the provider coming from the optical terminal in the entrance to the apartment, has sharply “sunk”, you can watch movies in (Ultra) HD format online: movie playback, which was still stable yesterday, “slows down” every second while loading data. A few years ago, the provider himself was to blame, but now the speed of the same Rostelecom among subscribers has grown so much that 95% of the time it will be normal, excluding the evening hours when the load is maximum. With constant "brakes" online video with 100% certainty, you can suspect a malfunction of either the cable or the router itself.
If the cable or router fails, the connection speed drops sharply
Router data buffer overload. Restart it.
You are too far away from the device. In fact, the Wi-Fi speed, depending on the distance between the router and the gadget / PC, as well as on the Wi-Fi signal level on the gadget itself, fluctuates hundreds of times - from 1 to 300 Mbps, this is how Wi-Fi technology works. If in one room the speed is 150–300 Mbps, then in the next room it can already be from 11 to 54 Mbps, and in the entrance or on the street it can drop to 1 Mbps. For cable connection (length LAN cable up to 250 m) Wi-Fi interruptions will not affect in any way.
Choose auto-speed switching based on Wi-Fi technology

The last point requires clarification. The fact is that the Wi-Fi speed is switched by the router and the gadget automatically. Even if you forcibly turn on the maximum (802.11n or 150 Mbps), then moving into the next room, you may lose your Internet connection - incoming and outgoing traffic will “freeze”, sites will stop opening and instant messengers will stop working, even simple ones like ICQ , because lower-level speeds (802.11g, or 54 Mbps) will not be enabled.

Different types of Wi-Fi networks support different speed data transmission

Check the auto speed selection in the router settings.

Tip for experimenters: without highly directional antennas and amplifiers, do not stay far from the router.

Video: how the provider's speed is "cut" by a Wi-Fi router

Diagnosis of causes

Since there may be several causes of the problem, we will consider each separately below. In general, to begin with, you will need to do some diagnostics and check if there are any problems with the power supply of the router and the device itself. In the case of the first, everything is determined quite simply, to check the second, you need to try connecting other devices to the network - tablets, phones.

If everything works fine, it is possible that the problem is only with the computer, and you need to consistently check the operation and settings of its adapter.

energy saving

The next thing we should do if the Wi-Fi network is lost is to diagnose using the system. Click on the wireless network signal icon and find the item "Diagnosis of problems", and then follow the instructions. Perhaps this option will help you.

Open "Start" and in it find the "Control Panel" we need. Now we need the settings that are hidden under the Power Options icon.

There will be several options here, and if you do not want to set high performance, then you need to select at least "Balanced mode".

In case of unacceptability and this option, you can only set the consumption separately for the adapter. Click "Setting the power plan" next to the desired option.

Now "Change advanced options".

Here we scroll down and find the “Adapter Settings” item - you need to open the parameter tree, then open the “Energy Saving” sub-item again and there, in the “Battery” and “Main power” parameters, set “Maximum Performance”.

Everything that could be done here, you have done - now click "OK", "Save changes" and close the window.

The second option also, in a sense, depends on the power settings - it happens that when the user sends the computer to sleep, after turning on the adapter still remains in this mode.

Click "Start" again and click on "My Computer" and select "Properties".

Inside it will be a lot of equipment, but we are interested in network adapters. Having opened the tree with them, we are looking for the one with the Wi-Fi attribute and double-click the left mouse button.

Here we are looking for "Power Management" and uncheck the box "Allow the device to turn off to save power." Next, click "OK" and test how everything works. For more confidence the best option will restart your device after all these operations.

Sometimes the problem may be in the oxidation of the adapter contacts, not connecting it after cleaning or repair, or in the device drivers. In the first two cases, only mechanical intervention will help. To update the drivers, you need to find the name of your model and go to the official website of the manufacturer to download the necessary programs.

This is all that could be done on the computer side if the Wi-Fi network was lost, and now we will consider solving the problem on the side of the distributing point.

If the reason is in the router

If, after all the checks, you came to the conclusion that the problem is with the distributing device, then you can’t do much here: when the router is turned on and working normally, even without special settings and the provider’s cable plugged in, the network will be determined and should not disappear.

Bought a laptop, phone or tablet. A portable device is specially selected to access the Internet via Wi-Fi in any accessible place. However, an unforeseen difficulty arises: for some reason, the connection suddenly disappears. What is the reason? Let's figure it out.

Abrupt and sudden disconnection of the wireless network can happen due to several reasons. They are presented below:

Wi-Fi coverage may disappear due to the fact that one of the functions of any modern device Whether it's a laptop, tablet or phone, is battery saving.
An important reason may be the presence of a weak Wi-Fi signal.
Another reason is unexpected driver failures, including the driver responsible for the quality of the wireless network.

However, whatever the reasons why Wi-Fi turns off, they are all pretty easy to fix. It is only important to be able to make the necessary settings, or reinstall the driver. In this case, it is best to download the driver from the official website of the manufacturer, otherwise serious problems may arise in the operation of Wi-Fi. Let's talk about problem solving in more detail.

What to do if there is a weak signal or sources of strong interference?

This factor is a fairly common reason for disabling Wi-Fi communications. Needless to say, this coverage is based on radio signals that can be swayed. It is worth saying directly about the signal level that it is not always stable. It is influenced by some factors, of which the most significant is the voltage in the electrical network. A wide variety of electrical devices are involved in creating interference, which can sometimes be so strong that it interferes with the propagation of a Wi-Fi signal.

Even more annoying is the presence of metal objects between the portable device and the router. When the laptop is located at a fairly large distance from the signal propagation point, it may periodically disappear. Therefore Wi-Fi is turned off. As already noted, the signal is not stable.

When a laptop, phone or tablet is located near the router, the fluctuations are imperceptible, and as they move away, they begin to manifest themselves more and more, and as a result WiFi connection breaks off. Communication has a particularly negative impact mobile phones or microwave ovens. You can fix the problem by moving the laptop closer to the wireless router.

Problems Caused by Battery Saving

As you know, one of the fundamental functions of any laptop, tablet and phone is offline work, which is achieved due to high-quality battery saving. In this regard, the developers have created special program, which allows you to save energy, and which automatically turns off modules that are not used for a long time.

The same applies to the Wi-Fi adapter. It is quite possible that it will automatically turn off when not in use. However, it happens that the program gives certain failures and, as a result of an unstable connection with Wi-Fi, the adapter turns off after a certain period of time, regardless of whether it is needed in this moment Internet connection or not needed.

You can solve the described problem by disabling the mentioned option. To do this, you need to pay attention to the battery icon in the lower right corner of the screen. Select it and go to " Extra options recharge the battery”, and then set the optimal recharge plan. It is quite possible to experiment here until the optimal plan is found.

Finally, select the "Edit" icon. The Power Saving Modes window appears. Here you need to ask maximum performance both when running on battery power, and when operating from the mains. In this way, automatic shutdown The Wi-Fi adapter will become inactive. As a result, Wi-Fi will not suddenly disappear.

However, what if all the work is done in the right way, but there is still a permanent shutdown WiFi connections? This means that in the operating system installed power saving settings. Disabling this feature is possible using the "Wireless Network and Sharing Center". All you need is to right-click on the "Wi-Fi" icon. Then you should select the required pop-up sub-item - "Change settings". Here you need to find the shortcut for the wireless connection and click on it right click. In "Properties" select "Network". Then you should go to "Settings" and select "Power Management". Here you should uncheck the box "Permission to turn off the device in order to save electricity".

I bought D-link router DIR-651, set up everything according to the instructions and ran into a problem that when the computer and power are turned off, the router resets the DNS server settings.

Foreword ... Solution of the problem with the router (router), see below ↓

It all started with the fact that I first connected the router via LAN to a desktop computer. I wrote down everything I needed, the router turned on and started working, the Internet appeared, and I was delighted. Then I thought that I should check the Wi-Fi.

Turned on the laptop, he found wireless connection to the router, connected everything, the Internet worked, and the sites began to open. Well, I also decided to check the wireless Wi-Fi connection from my phone and tablet. And everything turned out well there, the connection was successful, and the Internet appeared.

The next day, turn on the router, then a laptop, and ! Or rather, writes that the network without access to the Internet. There is a wireless connection itself, Wi-Fi is working and the network is connected, and in the corner near the clock, the icon is drawn that "a network without access to the Internet."

At first I thought it was a problem with the ISP. I think as a copywriter - logically, you need to turn on your desktop computer and see if there is Internet there! I turned on the computer that is connected via LAN to the local network - the Internet is working.

Why on a laptopWi-Fi network disappears?

I bought a D-Link DIR-651 router, set everything up according to the instructions and ran into a problem that when the computer and power are turned off, the router resets the DNS server settings. Foreword... Solution...

Wi-Fi technology is very widely used in the life of a modern person, because it allows you to easily and quickly solve the problem of connecting to the Internet without using conventional wires. This is especially true in the case of using laptops, with the help of which you can access the Internet in any convenient place due to the presence of a built-in Wi-Fi adapter.

That is why the situation when Wi Fi does not work on a laptop leads to significant inconvenience and even some problems. The reasons why on laptop computer may not work Wi-Fi, there are quite a few. It is simply unrealistic to solve the most serious of them on your own without the help of specialists, but there are quite a lot of those that can be completely eliminated on your own. Let's consider them.

Problem with laptop or router?

A fairly common problem is that the laptop has stopped connecting to WiFi networks, the problem is not with the laptop itself, but with the settings of the router, which distributes the network. Thus, the laptop can be configured correctly, but Wi-Fi still does not turn on precisely because it has nothing to connect to.

To exclude the possibility that the problem is related to this, you should try to connect to the network from any other device that is equipped with WiFi adapter– from another laptop, smartphone, tablet, etc.

If Wi-Fi does not work from another gadget, then the problem lies precisely in the Wi-Fi router distributing the Internet. If the connection is successful, the problem is in the laptop and before solving it, you first need to determine why Wi-Fi stopped working.

Hardware enable adapter

Based on this diagnosis, it can be precisely determined that this problem arose precisely because of the laptop. When Wi-Fi does not work on it, you can try using several methods.

The first one is to check if the wireless connection adapter is enabled on the laptop. Almost all modern models have indicator lights. WiFi work module and for its hardware inclusion there are special key combinations.

Usually, a lit indicator indicates that the module is on. If the indicator does not glow at all or shines in red, then the Wi-Fi does not work precisely because of the wireless network adapter. It needs to be enabled.

Most often, such indicators are located directly on the keyboard, side or front panel of the device. Sometimes they are located on the monitor case or near the touchpad.

To enable the module of such a network, press the key combination Fn and one of the system F1-F12. The specific combination depends on the laptop manufacturer. Usually, the corresponding antenna icon is located on the desired key. If it is not there, then to enable Wi-Fi, you should try to press the standard button for specific model combination:
Fn+F3 for Acer;
Fn+F2 for Asus, Dell or Gigabyte
Fn+F5 on Fujitsu devices;
Fn+F12 on HP laptops.

After pressing the appropriate keys, we check whether the indicator of the wireless connection module lights up or whether it stops glowing red. After that, you should try to connect to the network again. If this does not help, go to the next step.

Software inclusion

When Wi-Fi stopped working and its hardware inclusion does not give positive results, it is also necessary to implement its software inclusion, which is carried out directly from the operating system under which the laptop is running.

To implement software turn on WiFi, which stopped working, on Windows 7, 8 or 10, you need to perform the following sequence of actions:

1. On the notification panel, which is located near the clock, the network connection status icon is selected;

2. From the list that opens, select the item "Network and Sharing Center" or " Network settings» depending on the version of the operating system;

3. The next step is "Change adapter settings".

Among the list of all existing connections, you need to pay attention to the color of the “Wireless” icon. network connection". If your WiFi does not work and wireless adapter disabled, the connection icon will not be highlighted. In this case, right-click on its icon, from the opened context menu select "Enable". In this case, the color of the connection icon should change.

At the same time, the wireless network adapter turns on, it remains to find the desired one in the list of available wireless networks and connect to it.

If, after such WiFi Actions, which has stopped working, continues to be inactive, you need to move on to the next method for solving the problem.

Installing and updating the driver

Quite often, the Wi-Fi wireless connection does not turn on due to the lack of a driver or when it is very outdated. To determine the presence installed driver, it is necessary from the context menu of the "My Computer" icon, which is located on the desktop or in the "Start" menu, select the "Properties" item. Next, in the window that opens, select the "Device Manager" command from the menu on the left.

In the new window that opens with a list of connected devices, you need to find the name of the laptop's wireless network adapter. Usually its name is "Wireless network adapter” or “Wireless Network Adapter”, along with which the manufacturer of the device must be indicated: Realtek, Atheros, Qualcomm, or something else.

Having found the desired item and clicking on it with the right mouse button, "Properties" is selected from the context menu. In the window that opens in this case, the item "The device is working properly" should be present. But even if there is a mark about normal operation device, this is far from a guarantee that the correct driver version is installed and Wi-Fi is turned on correctly. To check it, in the properties window wireless device go to the "Driver" tab and pay attention to the items "Date of development" and "Supplier".

In the event that the supplier is Microsoft or the date of development of the program is several years behind the current one, go to the official website of the laptop manufacturer and download the latest official version of the driver.

The same should be done if among the list installed devices there was no wireless adapter.

If the module is in the list of devices wireless communication present but marked in yellow exclamation point, this means that the device is disabled, causing the network to stop working. In this case, having opened the device properties window, you need to click the "Enable" button.

Another reason why Wi-Fi stopped working on a laptop may be that the power saving mode is enabled, which prevents the wireless connection from working. To disable it, you need to do the following:
1. Open Control Panel;
2. Select the "Power" icon;

3. In the window that opens, select the "High performance" or "Balanced" mode.

External signal obstructions

It should also be noted that the non-working wireless network can also be the result of more than just problems with the laptop. The wireless connection signal depends on some external factors that can weaken it. Ceilings, walls, floors, and similar obstacles significantly degrade the signal quality of the access point and laptop.

As you know, signal quality personal computer displayed as several marks - the more there are, the better the signal is. If the wireless connection level is displayed as 1 or 2 marks, then you can not try to use WiFi - in this case, it will not work properly.

In this case, you need to move the router closer to your workplace, move workplace closer to WiFi router Or buy a new, more powerful router.

If nothing helped

If none of the tips above helped, you can use a simple, but at the same time often effective solution: restart both the computer and the wireless router. Please note that after a reboot, the router turns on for up to 5-10 minutes before it starts distributing the network. Be patient. Also, despite the opinion of many skeptics, sometimes the troubleshooting function that is in the Windows operating system helps to solve problems with a wireless network.

Thus, most of the above existing solutions problems related to the fact that Wi-Fi stopped working on a laptop. Almost all of these methods and recommendations can be used by anyone who has encountered a similar problem, since this does not require any special skills.
If nothing helps, and the wireless network does not start working, there is only one way out - to go for help to a quality service center where they can solve any problems with the laptop.

If the article did not help solve your problem and Wi-Fi still does not work, write in the comments, I will try to help.

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