So you shouldn’t immediately start panicking, mentally calculating the unexpected costs of purchasing a new computer system.
Modern computers are quite reliable and do not fail very often (this means the hardware), so if used carefully, the likelihood of a serious breakdown is low. That is why, if after turning on the computer turns off, then you first need to make sure that the failure is not due to some trivial detail.
Let's start with the simplest
It is quite obvious that if power is supplied and turned off by pressing the Power button, then the test should begin with it. To do this, you need to remove the left side cover of the system case and carefully inspect the connectors to which the wires from the buttons, speaker and indication diodes are connected. The task is simple: you need to temporarily disconnect the connector going to the power button (its two contacts are labeled Power or PWR). After this, you can turn on the system by briefly closing these contacts with a screwdriver.
If the failure has disappeared, then we close it again, holding the screwdriver on the required contacts for about 4 seconds - the computer turns off immediately, or we simply turn off the power. After this, all that remains is to revise the button or, which is simpler, switch the connector from Reset to Power (their contact closure diagram is the same): in any case, hot restart is currently almost never used by most users.
Operation of electrical protections
Although all expansion components connected to the motherboard are fixed in one way or another, sometimes a partial loss of contact occurs, and the computer turns on and off immediately due to the action of protection in the power supply or the logic circuits of the board itself. The most common cause is the discrete video card being removed from the slot. Sometimes it is enough to accidentally move the system unit or slightly touch the cable running from the computer to the monitor for it to be partially removed from the connector. The consequences can be different: from working only in 2D mode to freezing. It is also quite possible that the computer turns on and immediately turns off. A similar problem may be associated with memory modules. Moreover, a computer in which the memory stick was not correctly latched can work for years until a failure appears.
So, if the computer turns on and immediately turns off, then you need to remove the video card and memory modules from the connectors, clean their contacts from the oxide film with an office eraser and carefully install them back.
Did you call Cinderella?
Many computer owners forget that the system unit requires periodic cleaning of dust. It not only disrupts the temperature conditions of the components, but can also short circuit tracks on the board. To avoid this, we recommend thoroughly purging the entire system unit at least once every 6 months. Sometimes after cleaning, normal operation of the computer is restored.
Power supply is the basis of the system
When purchasing a new power supply, many consultants honestly warn that the service life of this element is shorter than that of other components, and it requires periodic replacement. This is especially true for budget models with “inflated” watts. Thus, if power-on failures occur, you need to check the functionality of the system with a different power supply. It is quite possible that its power is simply not enough. By the way, if there is a voltage switch on the power supply case, you need to make sure that the desired mode is set.
We calculate the “culprit”
Experienced users, when determining the cause of such a failure, proceed as follows:
Disable all non-essential expansion cards and memory modules (leave one that is known to work);
Disconnect all plugs from the block on the board;
Disconnect and reconnect all power cord connectors.
If the problem persists, then you need to check the functionality of the motherboard and central processor. However, this can only be done if there is something to replace them with.
It became available to all segments of the population. Now anyone can buy a computer: the abundance of specialized stores allows you to choose the optimal model, and the availability of educational literature allows you to understand the basics of work. Despite this, owners of computers and even laptops sometimes have situations when they have to resort to the services of specialists who can troubleshoot various problems. And yet, it is much more convenient not to depend on the help of third parties, but to be able to diagnose possible problems yourself and be able to restore the functionality of the equipment. That is why today we will look at why This is one of the common problems that a fairly wide range of users sometimes have to face.
If the computer turns on and immediately turns off, then in the interval between this, the speaker connected to the board will usually emit a series of intermittent beeps. There are special tables that, knowing the order of the signals, can be used to determine the cause of the failure. Otherwise, the search is performed using indirect criteria.
Before you begin to find out the reasons, you need to disconnect all auxiliary peripherals from the board: hard drive, CD drive, sound adapter, all devices connected to the ports (except for the keyboard), casing cable (wires to the Power, Reset button, etc.). In addition, there should be only one power cable left - only to the motherboard, disconnect the other branches.
We perform a test run. To do this, use a small screwdriver to close two Power contacts on the board. Problem still exists? Read on.
If your computer turns on and then turns off immediately, you need to check your BIOS settings. Of course, this is only possible if enough time passes between turning on and off. Many boards have a setting item that automatically turns off the computer in one of two situations: the CPU fan does not rotate (faulty), or has reached the set limit. Let us recall the steps to enter the BIOS: immediately after turning on the computer, you need to frequently press the DEL key.
We should not forget about the possibility of resetting the BIOS (this is the next step if the previous one did not produce results). There are special pins on the motherboard labeled “Clear CMOS”. We find them directly on the board or first in the instructions, and then close the contacts to reset the settings to factory settings.
The next reason why the computer immediately turns off is problems with the processors of modern graphics solutions sometimes failing: just remember the “failure” of NVidia video card chips. We remove the video card from the connector and turn on the computer without it. If spontaneous shutdown does not occur, then the “culprit” has been identified. You need to reinsert it into the connector and check its functionality, and based on the results, make a decision: keep it or buy a new one.
The computer is showing signs of life - the speaker beeps shrilly, which means there is a chance to get by with “little loss”, since the motherboard is intact.
If after turning on the computer turns off, then you need to leave only one. You can also try moving it to another connector.
The last reason why a computer turns on and then turns off immediately is that the motherboard itself is faulty. Very often, when connecting expansion cards (for example, sound and video adapters), the motherboard bends greatly, and the soldering of the elements to the conductive paths is broken. Owners of old generation boards (and budget new ones) over time are faced with natural damage to electrolytic capacitors - those very small barrels. If this happens, then the behavior of the board depends on the circuit in which the capacitor is located: the computer can turn off either instantly or after a while.
The power supply contains a cooling fan; if it stops working, the overheating protection circuit cuts off the power supply. Indirect reason: an excessive number of powerful components connected to the computer.
Summarize:
We disconnect everything unnecessary from the board;
Check the BIOS, reset the settings;
We localize the hardware fault.
In the life of almost every user, there have been situations when a computer or laptop suddenly began to behave differently than before. This can be expressed in unexpected reboots, various interruptions in operation and spontaneous shutdowns. In this article we will talk about one of these problems - turning on and off the PC instantly, and we will try to solve it.
There can be quite a few reasons for this PC behavior. These include incorrect cable connections, careless assembly, and failure of components. In addition, the problem may lie in some operating system settings. The information that will be given below is divided into two parts - problems after assembly or disassembly and failures “from scratch”, without outside intervention in the computer hardware. Let's start with the first part.
Reason 1: Cables
After disassembling a computer, for example, to replace components or clean dust, some users simply forget to reassemble it correctly. In particular, connect all cables in place or connect them as securely as possible. Our situation includes:
Reason 2: Short circuit
Most power supplies, including budget ones, are equipped with short circuit protection. Such protection turns off the power supply in the event of a short circuit, the reasons for which may be the following:
Reason 3: Sudden increase in temperature - overheating
Overheating of the processor during system startup can occur for several reasons.
- A non-working fan on the cooler or a disconnected power cable of the cooler (see above). In this case, when starting, it is enough to monitor whether the blades are rotating. If not, you will have to replace or lubricate the fan.
- Incorrectly or crookedly installed CPU cooling system, which can lead to incomplete contact between the base and the heat spreader cover. There is only one way out - remove and reinstall the cooler.
Reason 4: New and old components
Computer components can also affect its performance. This is either simple carelessness when connecting, for example, an old video card or RAM modules, or incompatibility.
Reason 5: Dust
The attitude of users towards dust is often very frivolous. But this is not just dirt. Dust, clogging cooling systems, can lead to overheating and failure of components, the accumulation of harmful static charges, and at high humidity it even begins to conduct electric current. What this threatens us with is discussed above. Keep your computer clean, not forgetting the power supply (this often happens). Clean from dust at least once every 6 months, or better yet, more often.
Reason 6: Power supply
We have already said that the power supply “goes into protection” in the event of a short circuit. The same behavior is possible if its electronic components overheat. The reason for this may be a large layer of dust on the radiators, as well as a non-working fan. Insufficient power supply will also cause a sudden shutdown. Most often this is a consequence of the installation of additional equipment or components, or the advanced age of the unit, or rather, of some of its parts.
In order to determine whether your computer has enough power, you can use a special calculator.
You can find out the capabilities of the power supply unit by looking at one of its side surfaces. In column "+12V" The maximum power for this line is indicated. It is this indicator that is the main one, and not the denomination written on the box or in the product card.
One cannot help but mention the overload of ports, in particular USB, with devices with high energy consumption. Interruptions occur especially often when using splitters or hubs. Here we can only advise you to unload the ports or buy a hub with additional power.
Reason 7: Faulty hardware
As mentioned above, faulty components can cause a short circuit, thereby triggering the power supply protection. It could also be a failure of various components - capacitors, chips, etc., on the motherboard. To determine the faulty hardware, you need to disconnect it from the motherboard and try to start the PC.
Example: turn off the video card and turn on the computer. If the launch is unsuccessful, we repeat the same with the RAM, only you need to turn off the strips one at a time. Next, you need to disconnect the hard drive, and if there is more than one, then the second one. Don't forget about external devices and peripherals. If the computer does not agree to start normally, then the problem is most likely with the motherboard, and it should go straight to the service center.
Reason 8: BIOS
BIOS is a small control program written on a special chip. With its help, you can configure the parameters of motherboard components at the lowest level. Incorrect settings can lead to the problem we are currently discussing. Most often, this is setting frequencies and (or) voltages that are not supported by components. There is only one way out - reset the settings to factory settings.
Reason 9: OS Fast Startup Feature
A quick startup feature present in Windows 10 and based on saving drivers and the OS kernel to a file hiperfil.sys, may lead to incorrect computer behavior when turned on. This is most often observed on laptops. You can disable it in the following way:
Conclusion
As you can see, there are quite a lot of reasons causing the problem under discussion, and in most cases its solution takes a sufficient amount of time. When disassembling and assembling a computer, try to be as careful as possible - this will help avoid most of the troubles. Keep your system unit clean: dust is our enemy. And the last piece of advice: do not change the BIOS settings without prior information preparation, as this may lead to the computer not working.
Computer won't turn on: PC turns on and then turns off immediately
Does your computer turn on and then turn off immediately? If so, then most likely you have a serious hardware problem.
There are several reasons why your computer turns on and immediately turns off during the boot process or the computer does not turn on.
Important: if your computer does not turn on, or you do not see anything on the screen, then read in more detail the instructions “The computer will not turn on: the PC does not show signs of life” - this is the most applicable guide to troubleshooting problems.
Difficulty: medium
Time required: from several minutes to several hours, depending on why the computer does not turn on
How to fix a computer that turns on and then turns off
- If you hear a beep when you turn on your computer, this suggests that in this way you can eliminate the causes of PC problems.
- Next, you need to make sure that the mains voltage is within normal limits.
- Check all possible causes of a short circuit inside the computer. Often, this is the reason why the computer turns off immediately after turning on. The computer may stay on for a second or two, but then shuts down completely.
- The power supply needs to be tested. Even if your computer turns on, this does not mean that it is working properly. If the power supply is not working properly, replace it.
- Also check the button Reset, which is located on the front of the computer system unit. Maybe this is what is causing the short circuit.
- Try reconnecting all PC components: cables, memory modules and boards.
- Try reinstalling the processor if you suspect it may have become loose or is not seated properly.
- Start your PC with all the necessary hardware. Our task is to turn it on with a minimum amount of equipment, while maintaining its functionality.
- Reconnect each hardware and test your computer after each installation.
- Test your PC using the card's power-on self-test. The PC will help determine which part of the remaining equipment is to blame for the breakdown.
- Try replacing the hardware on your computer to determine which piece of hardware is causing your computer to shut down automatically. Test your computer after each hardware replacement to determine which hardware is at fault.
- And finally, if all the other methods I gave above did not work and did not help eliminate the cause of the problem, I recommend that you seek professional help from a computer repair service center. Or - for technical support directly from the manufacturer. Experienced specialists will be able to answer the question of what to do if the computer does not turn on.
The sound signal gives a very good idea of where exactly to look for the cause of your computer failure.
If this method does not help you fix the problem in this way, you can always return here and continue troubleshooting using the information that will be presented below.
If the computer is connected incorrectly, this can also lead to a failure. Additionally, incorrect power settings may cause your computer to shut down on its own.
Important: In order not to waste extra time, you need to inspect your computer from the inside for problems that could cause a short circuit.
If you are not in a hurry, pay the greatest attention to this stage of testing in order to eliminate all possible causes of a short circuit, and subsequently avoid unnecessary costs for expensive equipment replacement.
Tip: if you decide to replace the power supply, then after replacing it you need to keep it turned on for at least 5 minutes before trying to turn it off and start using it. This will give the CMOS battery time to recharge a bit.
The processor is a rather sensitive element of the computer, but if it is the reason that the computer turns on and turns off immediately, it is quite easy to fix the problem. So don't worry!
If your computer turns on and stays on with the necessary hardware, refer to step 9.
If the computer does not turn on or turns off on its own, go to step 10.
Important: troubleshooting is easy enough for any user and does not require the use of any special tools. In addition, it can provide a lot of very valuable information. This step should not be skipped if after all the steps above, the computer still turns off by itself.
Since your computer is turned on, all components are working properly. This means that, apparently, one of the devices was disconnected or connected incorrectly, which caused the computer to turn off by itself. After reconnecting each device and testing, you will be able to find out for sure which device caused the computer to malfunction.
Replacement of faulty equipment should occur immediately after you have identified the cause. Hardware settings may come in handy after you reinstall your hardware.
If the computer does not turn on, go to step 11.
Most PC users have a large number of spare computer parts. The computer won't turn on - go back to step 10. The card isn't expensive, and it's a much smarter approach than stocking up on spare computer parts.
Unfortunately, if troubleshooting by unplugging and plugging in equipment and replacing computer parts is unsuccessful, there is another, small option that is much better than relying on individuals and companies.
If your laptop does not turn on or a black screen appears when booting, read the article “Laptop does not turn on - black screen”
If I missed any point or you have any questions, you can write and ask questions in the comments. You will receive an answer in the shortest possible time.
A computer is a complex device where each component must work correctly, ensuring the smooth operation of the entire system. If a serious problem occurs with your computer, for protection purposes it may suddenly turn off immediately after turning on.
The problem of the computer suddenly turning off is quite common, and there are not many reasons for such a problem. Below we will look at the main ones, which most often influence the occurrence of such a breakdown.
Advice: if the BIOS makes sounds before shutting down, you need to remember them and run them through any search engine. Often, the BIOS can tell the user what problem in the computer caused it to suddenly shut down, so you can identify the cause much faster and, accordingly, solve the problem.
Reason 1: cooling system failure
First of all, when faced with a sudden shutdown of the computer immediately or almost immediately after turning it on, you should look under the body of the system unit and see if there is dust and dirt in it.
If the computer has not been cleaned for years, then large amounts of dirt and dust could accumulate on coolers, boards, microcircuits, etc. If you see that there is enough dust in the system unit, it must be collected with a vacuum cleaner and then carefully cleaned from the residue with a brush.
Particular attention should be paid to the cooling system: thoroughly clean the radiator and cooler of dust, and also replace the thermal paste between the radiator and the processor. After assembling the computer, turn it on and check whether the cooler is spinning - it is quite possible that the fan has completely failed and may need to be replaced.
Reason 2: RAM problems
Incorrect connection of RAM or failure of the stick can cause a problem with the computer suddenly shutting down.
Carefully inspect the computer's RAM to see if all the sticks are connected properly. It is recommended to carefully inspect the strips themselves and the slots into which they are connected: if damage is found, this only confirms the cause of the problem.
If several sticks of RAM are connected to the computer, it is recommended to disconnect one stick at a time and check the functionality of the computer: if one stick fails, the computer will start and work normally.
Reason 3: problems with the power supply
The power supply is the most important device in a computer, playing an important role in its correct operation. When faced with a system shutdown, you need to think about the performance of the power supply.
You should definitely inspect the internal component of the power supply: whether it is clogged with dust, whether a foreign object has got into its insides causing a short circuit, and whether the capacitors are swollen.
Reason 4: Problems with the motherboard
Quite often, the reason for a sudden computer shutdown can be caused by the computer’s motherboard: a failure of one of the connectors, a problem with capacitors, etc. In this case, as a rule, the motherboard needs to be completely replaced.
Reason 5: BIOS failure
As a rule, this cause of the problem concerns you if you have previously made changes to the BIOS settings. Incorrectly set parameters can easily result in the computer turning on at first, but then abruptly shutting down due to the inability to continue working.
In this case, collecting BIOS settings will help you get out of the situation. As a rule, a similar procedure can be performed by entering the BIOS, and then finding and selecting the option Load Optimized Defaults, Load Fail-Safe Defaults or Load Setup Defaults.
These are the main reasons that can suggest why the computer suddenly turns off. If you cannot fix the problem on your own, do not delay going to the service center.
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