The computer turns itself off during operation

Hello. It all started yesterday when I was happily playing csa and suddenly boom, the computer crashed. It was exactly as if my electricity was turned off for a moment. As if I pulled the plug from the socket. There was no message, no sound, it just worked and suddenly it collapsed. I turned it on again and after a while it was the same again. I scanned the malwarybtes, adwcleaner, ccleaner computer and thought it would be fine, but it has been like that until now. About 15 minutes ago I was playing coda and suddenly the same thing. I thought that maybe they were doing something with the electricity and that's why they turn it off, however, it is not the fault of the electricity, because he was in the whole house all the time. I monitor the temperatures on a regular basis and they are ok, the computer is well-kept, cleaned. I will give the specifications because it will probably be useful:

- AsRock N68C-S UCC
- AMD Phenom II X4 840
- 8 gb GB framework RAM - Crucial
- Zotac GTS 450
- Corsair VS450

It comes to my mind that maybe this is because the power supply, having these protections, just cuts the power so that nothing bad will happen. However, I have no idea what might be causing this behavior. This is just my theory.

I changed the title to adequate. RADU23

First, measure with a voltage meter. If they are ok, then run the memtest from the flash drive and make 2 full runs. Then I suspect the motherboard and graphics card.

Only I do not have such a meter at home, besides it happens quite rarely so it would be hard to observe what is happening at this moment

Buy it, recently even at a gas station I saw. You can also buy in every supermarket for a maximum of PLN 20.
You fire up some benchmark and measure the voltage. The manual is on the forum.

https://www.elektroda.pl/rtvforum/topic1199202.html
Instructions here

Run the OCCT test "power supply". Do it even now - if the computer behaves the same immediately or after a few minutes, the power supply is almost certainly defective.
If not, then buy a meter (it's really worth buying, you will see for yourself how many applications you will find for it, for example checking the batteries or accumulators or the battery in the car, etc. etc.) Take measurements first at rest, i.e. start the PC, there is a desktop and you measure. Then under load - power supply test the same measurements - the key is fluctuating values and extreme values, therefore such a measurement.

Ok, I'll do it, but I will add that the computer started to crash the internet from time to time. Suddenly he shows me a yellow triangle next to the net on the bar. Usually it either fixes itself or removing and inserting the internet plug helps. Maybe it's some kind of infection after all? The last time I scanned it, I had a Trojan, could it leave such an infection?

The infection is not a reason to turn off the computer just like that, test the power supply with a meter as your colleagues wrote above (or replace it with another, preferably branded one: https://www.elektroda.pl/rtvforum/topic3087862.html and check if the computer will behave then stable in the OCCT test).

Do you have a computer connected directly to an outlet or to a power strip?
Even here there can be a problem

I have it connected to the strip, but it worries me that the internet breaks down and it is not the provider's fault because I have optical fibers and the wifi works all the time in my phone.

EDIT
Hello, after a short break, I watched my computer behave. During the test of the power supply at occt voltage normal, stable and nothing happens. The computer still turns off at random times. Sometimes while playing, most recently after d yt watch time, and even once right after turning on the computer on the desktop. It's just as if I pulled the plug out of the socket, I changed the position of the plugs in the strip, but this is not the problem, because then other things that I have connected there would also break out. The power supply is under warranty, I have only had it for over a year, so when I can send something back under warranty. Could there be any other reason besides the power supply? Let it not be that I will give back the power supply and it turns out to be not it.

I merged. RADU23

Motherboard, but then diagnosis and repair is almost an abstraction.

So what should I do?

Did you take the memory test? Maybe I missed the answer somewhere. If you did 2 Memtest runs, and found no errors, borrow a power supply from someone and then check if the problem persists.

It's a good thing, I fired the memtest, the first run went without problems, the second at about 70% my computer crashed. He turned off. The program did not show any error because it did not have to because the computer turned off. Now either it was pure coincidence and at that moment the computer randomly shut down or something with the frame. For information about the frame I bought a new one 4 months ago, it is a Crucial Ballistix 8gb in two 4gb bones, clocked at 1600mhz and cl9 delays.

Replace the power supply with a borrowed one.

The problem is that I don't really have anyone to borrow from. Today the computer turned off for the second time, once during the memtest and now on the desktop. I took out and put in the 24pin plug, blew into the power supply so that some dust fell out and changed the ram bones in places. We'll see. I could buy this voltage meter, but it will be difficult to measure it, because it happens rarely and at random moments, so it will be difficult to see if the voltage is defective when it is turned off. It seems to me that the framework can be excluded because it is probably not possible that the memory chip that I have just bought will cut off the power completely without any error or signal. Motherboard? Can he do something like that? She is a few years old, maybe 7 years old, but there weren't any problems with her before. Apart from this strange shutdown, nothing strange is happening with my computer. Sometimes it locks up, but it's the disk and processor's fault, but I've never had such fires with this shutdown.

Karcio22 wrote:

During the test of the power supply at occt voltage normal, stable and nothing happens.

I thought you measured these tensions during the test. Maybe you should start following the advice, then ask what to do next. I wrote about the memory test 2 weeks ago, you did it today ...

The memtest is time consuming and I don't always have that much time. I was talking about voltages about what the occt program was not by the meter. Ps. The computer shut down again. This is the 3rd time today.

The computer apparently crashes at random time, regardless of the load and the system. In the memeest, what is happening in the windows just happened.
Either the power supply has a discrete fault (replacing it with a certain one is the only way here) or the motherboard.
In my opinion, the only thing you can do at home is to substitute a different power supply.

You can also look for more sophisticated defects, see the CPU power sections, you can even remove the processor itself and reseat it by replacing the paste on the occasion. In the vicinity of the CPU, problems can also result in a reset. But after guessing, it's either the power supply or the motherboard in an unknown place, but rather not the CPU itself, because then the load should matter (it may be that there is a reset in idle, but then it is usually not under load anymore).

There was probably no talk of settings yet. There is no liability of any kind? BIOS reset hasn't hurt anyone yet. So do.

So yes, the OC is on the graphics but it does not matter because, first of all, it would only happen under load, and secondly, the graphics cannot just turn off my computer. For the test, I once cranked it up beyond capacity, it just stuttered the game or strange things happened but the power cut. The processor has recently replaced the paste (with the XD dropped and I had to play in straightening the contacts) so I prefer not to touch it for now You wrote something that causes a reset, it is not a reset but a power off. As if someone suddenly turned off my electricity. On another forum they advised me to take out one ram bone and see what happens. For now, I work on one and so far the computer works without a problem, but we'll see what will happen next. I will combine with this memory, if I do nothing, either the power supply or the disc will remain. I will also do a bios reset as you said.

Added after 1 [hours] 52 [minutes]:

The bios reset did not help. It pays me to play memory testing at all? Because I don't think they can make such a problem with cutting off the power. I know that the replacement of the power supply will be good, but I do not have much where to get one. Can you somehow check if the motherboard is sitting down? As you said, the power supply would rather fail under load, which is a bit strange. Can the crash of the motherboard be just such a cut-off of the power supply?

It is impossible to check the disc. Maybe in a workshop, but you can't diagnose the disc this way. It is already a higher driving school and with such an occasional defect it can also be a problem in the workshop.
That crooked CPU could be a clue. Perhaps one of the legs is not touching as it should.
Do you have Cool'n'Quiet turned on? Try to turn it off.

With the leg it is rather impossible because after this "incident" I did not move the processor and it worked without any problems for several months, so it can be ruled out. Cool n quiet turned off because the bios reset, it turned on by itself, because it seems to me that it was turned off, but I am not sure. I also switched the plug from the power supply directly to the socket. As the computer with one memory also turned off, I put it now in the second slot.

My computer also turned off by itself. It didn't matter if a game was running or I was on the desktop. It turned out that the cooling from the processor was damaged and this was causing the processor to overheat. After replacing the fan, everything was fine. I would like to add that sometimes the computer could not turn off for several days, and other times it turned off several times in an hour. See what your CPU temperature is right after your computer turns off.

Unfortunately that's not it. The fan is functional and the temperatures are fine. I bet on the power supply, do you think I should send it back under warranty or can I check something else?

Added after 21 [minutes]:

Unless there is still such a possibility, because the temperature on the prock under load while playing games does not exceed 40 degrees, which is quite a low result. However, on this phenom 840 processor it was like that from the beginning. There is also an option that the temperature sensor is damaged and indicates that the temperature is too low, even though it is too high. But probably then, after turning on the game, my computer would crash immediately due to overheating and less often during the desktop, and here I can play for a few hours and nothing will happen. The paste was replaced 3 months ago, the heat sink cleaned, so it is probably not the problem here, although it looks a bit like something is overheating.

I also had such a thing that I could play for a long time and it did not turn off, and it was able to throw out of the desktop after a few or a dozen or so minutes. Back then, I knew computers as much as I know ballet now. One friend came, he opened the casing and when he touched the cooling he got burned, after replacing it everything worked fine.

Only that I monitor the temperatures and under load they do not exceed 38 degrees on the processor. This one is very cool.

Have you ever monitored them with your finger? On box cooling, the reading is not very realistic.

Yes, I fired up the CS and touched the heat sink. Virtually cold, slightly warm. A few days ago, I took out one bone ramu RAM and the computer still shut down, so I put it in the other slot and it still turned off. So I took out this bone and put the other one alone. For now, it does not turn off for 3 days.

EDIT
He lasted a good week and it didn't turn off but it turned off again a few minutes ago. Rather, both bones ramu RAM are not damaged. So there is probably a motherboard or a power supply. I would bet more on the power supply

I merged the posts.
Please, when adding information, when no one has posted an answer yet, use the "change" button, without publishing the post under the post.
RADU23

I have the same problem, I bought a new computer but it came with a broken housing so I decided to get everything I can from the old one and do it somehow. After turning on Rainbow Six Single, the computer turned off after about 10 seconds. I thought it was the fault of the power supply so I replaced it
the problem was still there, but it did not turn off after starting only with some tasks, e.g. when I was looking for a match. At worst, I think it's the motherboard's fault, but I don't know, waiting for a reply.

I had exactly the same first replaced power supply ... well a few days again the same. Reinstalka procka replacement good with a few launches then harvest the same. And my hands were already falling off because I checked on the integrated and also the same thing when he breaks something, it works if not every 5 minutes he restarted .. and luck wanted that the batteries in the wireless keyboard were discharged, I replaced and the computer immediately restarts. And attention attention the problem disappeared I replaced the keyboard everything hula for a month now zero problems