Why The Computer Turns Off By Itself

One of the most common problems when working with a computer is a sudden shutdown. The computer shuts down by itself, without any user involvement. This can occur during increased load on the computer or in general, for no apparent reason. This behavior of the computer creates a lot of inconvenience, even if shutdowns occur infrequently.

It is for those who faced a similar problem and this article was written. Here you can find out the most likely causes of sudden computer shutdowns and find out what needs to be done to make your computer work properly.

Overheating of the processor or other computer components.

If your computer shuts down by itself, then the first thing to check is the temperature of the processor and other components of the computer. Usually, processor overheating leads to sudden shutdowns, but in some cases the problem may be overheating of other components. To check the temperature, you can use the HWmonitor program or any other program to monitor the current computer settings.

Why The Computer Turns Off By Itself

Problems with the power supply.

Problems with the power supply is the second most common reason that can cause your computer to shut down by itself. There are two main problems with the power supply: insufficient power or a malfunction. If your computer began to turn off after installing new components, then most likely your power supply has insufficient power. Most often this happens after installing a new video card. In this case, you need to choose a new power supply unit suitable for power. If new components were not installed, then your power supply may be defective. In this case, you just need to purchase a new power supply with the same power.

Viruses or damage to the operating system.

If the computer is infected with viruses, then you can forget about stable operation. The computer will slow down, fail, and shut down. If there is a suspicion of viruses, then you need to urgently install a good antivirus. It’s best to choose a trial version of a paid antivirus. A trial version will be more than enough to scan your computer and remove viruses. If the computer is seriously infected, then most likely you will have to reinstall Windows. Since system files can be damaged, which means that problems with turning off the computer can continue even after removing all viruses. In addition, some programs may cause damage to the operating system. For example, the use of various programs to optimize Windows can lead to such undesirable consequences.

Power outages.

Another reason for turning off the computer is a power outage. Even minor power surges in the network can turn off the computer. While the rest of the electronics in the house can work fine. You can solve problems with electricity using an uninterruptible power supply (or UPS).

Problems with drivers and antiviruses.

If the computer began to shut down by itself after installing the drivers or antiviruses, then perhaps the problem is in this software. Remove the software you installed and test the computer. Perhaps this will be enough to return your computer to stable operation. If the computer shuts down before you have time to uninstall these programs, then try to boot the computer in safe mode.

Problems with new components.

Not infrequently, after installing new components, the computer begins to behave unstably. It may shut down, overload, or not start at all. In this case, you need to return the computer to the configuration that was used previously. And test new components on another computer.

Serious hardware malfunction

If you ruled out all of the above problems, then most likely you have a serious hardware malfunction. Some of your components are broken and prevent your computer from working properly. It can be a hard drive, motherboard or RAM. If you have little experience in servicing computers, then you are unlikely to be able to independently verify all of these options. Therefore, if you have a suspicion that “something is burned out,” it is better to turn to a service center or an experienced computer programmer for help.

Often, a computer that worked normally before suddenly starts to shut itself down spontaneously. Determining why a computer shuts down by itself is not so simple. But to eliminate such problems when their cause has already been identified, almost any user with minimal knowledge of the hardware of the device and the principles of software operation can do it. The reasons for the occurrence of such a phenomenon and the methods for their detection will be discussed below.

  1. Why the computer shuts down by itself
  2. Overheating of PC components
  3. Malfunctions of the power supply and PC power supply
  4. Why does the computer turn off by itself without physical defects
  5. How to cure a virus infected computer
  6. Minor troubles

Why the computer shuts down by itself

There are several main reasons that can cause a spontaneous shutdown of a computer:

Overheating of PC components

If spontaneous shutdowns begin some time after the start of work, the problem is most likely associated with overheating of certain PC components. The most common causes of a malfunction in this case may be malfunctioning cooling system fans or a layer of dust on the radiators.

You should pay attention when exactly the computer turns off:

  • Shortly after loading the operating system, shutdown is preceded by short-term, short-term system freezes. Most likely, the CPU overheats;
  • After receiving a serious load, for example, simultaneous launch of several “heavy” applications. Overheating of the processor or video card;
  • Problems with the cooling of the video card are the reason why the computer shuts down during the game.

Video: Why The Computer Turns Off By Itself


The easiest way to solve the problem is to visually inspect the hardware of the computer, followed by maintenance of all cooling systems and cleaning the PC. Strong contamination of the radiators is not allowed, the fans installed on top must rotate evenly, without jamming or harsh sounds.

Maintenance is carried out in the following order:

  1. Dismantled expansion cards;
  2. Power cables, hard drives and optical disks are disconnected from the system board, the board itself is removed from the case;
  3. The existing cooling systems are dismantled;
  4. Radiators are cleaned of dust and dirt, this operation is conveniently carried out with the fan removed with a small brush (20-30 mm), it will be useful to dust off the entire surface of the motherboard;
  5. Contact surfaces on radiators, central and video processors are cleaned of old heat-resistant paste with subsequent application of a fresh layer;
  6. Faulty or seized fans are replaced with new ones;
  7. All systems are being installed in the reverse order.

Important: It often happens that there is simply nothing to replace a clogged fan with. In this case, you can try to “reanimate” the old. To do this, it is enough to remove the sticker or pull out the rubber stopper from its back side and drop 2-3 drops of machine oil into the opened hole, while scrolling the blades by hand. Then put the cork in place or seal the hole with tape (it is better not to use the old sticker) and replace the fan.

Malfunctions of the power supply and PC power supply

Often, especially in rural areas, the reason why the computer turns on and off immediately is the network voltage. It is quite simple to check using a simple Chinese multimeter. The rated voltage of the network is 220 volts, the PC power supply must maintain operability in the range from 200 to 240 volts. If the meter readings are outside the specified range, you should either contact the management company (as an option: contact a familiar electrician), or get a good voltage regulator.

Another common variant of problems with the power supply network may be malfunctions of the house wiring, for example, burnt out sockets or twists in junction boxes. It is worth paying attention to whether the computer’s shutdown does not coincide with the moments of turning on / off powerful consumers of electricity: electric heater, electric stove or kettle, refrigerator, etc. If such coincidences occur, you should examine your home wiring yourself or with the help of a specialist. This is especially important because malfunctions of this kind are fraught with much more serious consequences than problems with a computer.

The most common problems with the power supply are the following:

  • Overheating as a result of failure of the fan or severe pollution;
  • Failure of circuit elements (usually capacitors);
  • Overload caused by the installation of new devices, for example, a powerful video card.

The easiest way is to check if there are problems in the power supply, by temporarily replacing it with a known-good and, preferably, more powerful one. If after that spontaneous shutdowns ceased, the following should be undertaken:

  • Check the operation of the fan and, if necessary, replace it, or try to reanimate, as described above;
  • Clean the inside of the unit from dirt and dust. This can be done by removing the top cover and using the same narrow paint brush;
  • Inspect the capacitors installed on the board, swollen or with streaks of liquid under them, replace with new ones;
  • Disconnect recently installed devices: if after this the system is restored to working capacity, BP replacement cannot be avoided. It is serviceable, but not designed for increased power consumption.

If all these steps do not help, the power supply requires replacement, or a qualified repair.

Some more useful tips specifically for the situation when the computer turns off during the game:

Why does the computer shut down by itself
without physical defects

Another reason why the computer itself shuts down during operation may be viruses and other programs containing malicious code. There are hundreds of thousands of such programs, and their list continues to expand steadily. A little distracted from the topic of the article, we note that there are many ways to introduce viruses into the system. This can happen, for example, when downloading programs from the Internet or installing from pirated disks, when connecting removable media and mobile devices. Therefore, the presence of an antivirus program is today an indispensable attribute of the system; moreover, the program itself and its signature databases should be regularly updated.

How to cure a virus infected computer

If, in search of the reasons why the computer shuts down by itself, no defects in its hardware have been detected, it is necessary to carry out a diagnosis for viruses. To do this, you need a boot disk or a USB drive (“flash drive”) containing antivirus software. You can find the appropriate software and instructions for working with it on the website of any company that produces antivirus software. Needless to say, this work should be done on a “clean” computer.

After creating a “curing” disk, you need to load an infected computer from it. To do this, you need to enable boot from the DVD-RW or USB drive in the BIOS. After downloading, you need to run the antivirus program in the “virus scan and treatment” mode. This process can take a considerable time, up to several tens of hours, which depends on the capacity of the hard disk and the amount of information stored on it.

After receiving a message about the end of the check, you should restart the computer. Often than not, all the troubles end there. But, quite often, when system files are not recoverable by a virus, the OS cannot boot and will have to be reinstalled.

Minor troubles

Although we talked about fairly simple situations above, in practice things are often even simpler. For example, the on / off button may simply stick. On the front panel. In principle, it is from this button that you can start troubleshooting. To check it, you can turn off and start the computer by bridging the corresponding contacts with a screwdriver. If it stopped turning off, all that remains is to replace the button.

Another, quite common situation that repairmen often encounter is a computer installed in a narrow, closed on all sides, except the front, niche. Sometimes, the role of such a niche is performed by the compartment for installing the system unit in the computer desk. What can you do, not all furniture makers are computer savvy. In this case, it can be quite difficult to prove to the owner that his desk needs to be improved by using physical force to remove a piece of fiberboard behind the computer and that the small gap there under the interface and network cables is not enough for normal ventilation.

Given the above, it is better to use some kind of diagnostic utility, for example AIDA. The program does not require installation and is launched by clicking on the executive file. To control the temperature of the main PC nodes, you must select the “Sensors” item in the program menu and check their readings. In this case, it is advisable to properly load the system by running one or more resource-intensive programs, for example, virus scanning. It is advisable that the readings of the sensors never exceed 70 ° C. In some systems (most often AMD developers sin), the processor temperature is allowed up to 100 ° C, but this is undesirable. In any case, the readings of the sensors at the level of 70 ° C or more are an occasion to reflect on the state of the PC cooling system.

In conclusion, I want to recall the phrase that any disease is easier to prevent than to cure. This statement is true not only for people, but also for computers. Therefore, in order not to worry about the question of why the computer turns off by itself, it is worth monitoring its condition from time to time. To do this, you can use the built-in BIOS tools that display the temperature sensors of the chipset and the central processor. Keep in mind that these readings can be underestimated, because When viewing BIOS parameters, processor loads will be minimal.