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Newly built computer randomly shuts down after several hours of use.

Hi everybody,
Greetings!

{note:You can skip to the update below}

So, my newly built computer is almost perfect, except it shutdowns after about 11 hours+ of use. I think one happens at its 13th hour. I mainly use it for work (small 3d work, heavy 2d work, and rendering videos) and about 2-3 hours of playing games. I encountered the issue 4 times and it's only been a week since I finished building it.

Suspected issues:
1. I think that my new PSU Corsair RM750i is damaged.
2. I think that 750 watt PSU is almost enough to power the entire system for a long time(?)
3. Overheating problem(bad thermal paste) but it is unlikely the case, I'll try to change it anyway.

Processor: Intel Core i7 6700K @ 4.00 GHz
Motherboard: MSI Z170A Gaming M5
Graphics card: MSI GTX 1080 GAMING X
RAM: G.Skill Trident Z 16GB DDR4-3200 (2x8GB)
Cooler: ID-Cooling Frostflow 240L - Red
PSU: Corsair RM750i 80+Gold
SSD: Samsung 850 Evo 250GB
HDD1: WD Caviar Black 2TB
HDD2: WD Caviar Blue 2TB

No I don't overclock, I have 2 60hz tablet monitors, so there's no use overclocking. CPU and Mobo idle temp is at 31-40 degrees. even they are under load, it barely changes anything from that temp range. I've seen them once reach 49 degrees after playing Witcher 3.

As mentioned from the suspected problems, here are my thoughts.
1. PSU is broken. well, it is new, but I encountered problems with the old graphics card before, it's a stock gtx 760 gpu and it blows up so that must have damaged the psu. I was also given a broken ram, so before figuring that out, I had to try removing them and installing them over and over again, switching the psu on and off for many times. all these processes might have damaged the psu.

2. is 750 watts enough for my build? well I personally believe it is, but let me know about your thoughts base from the specs posted above.

3. Overheating problem? not likely, because as stated above, the temp is 31-49 degrees. never seen it goes higher than that. but I'd like to keep an open mind to see what somebody has to say. I used the thermal compound that came in with the cooler. I picked the cooler because I think I've seen in as one of the best hardware review base from 2015/16. I live it the 3rd world country so getting the parts/materials I want is hard. but I'll try to get my hands on it. I'll order some arctic silver 5 thermal compound as I've heard so much of it.

Let me know what do you think, any suggestion would be greatly appreciated.
Cheers,

Manuel.

--------------------------------------------
UPDATE 1:
- I tried reapplying the thermal compound, I used noctua NT-H1, that's the best I can get in my area. but it doesn't show any improvements at all.
-I tried buying a new power supply, Seasonic ss760XP(platinum-760). that's where I found out that my Corsair RM750i isn't broken after all.
-I also tried replacing a new cooler, but this time, it's just air cooler. deepcool gammaxx300. and I don't think it helps at all,if not, it seems worse. this aircooler is proven to be working as it is working perfectly now on an old computer.

Now, my predictions has narrowed down from this, but of course I don't want to spend more on a wild guess especially they cost a lot in my country, so I hope someone with greater experience can guess a little better for me.
I think that it's my motherboard all along. maybe it is damaged. can a motherboard cause this kind of inconsistency? or is it the processor, let me know. thanks!

UPDATE 2: SOLVED
I replaced the motherboard and everything worked as intended.
7 answers Last reply Best Answer
More about computer randomly shuts hours
  1. 1) 750W is enough for that build
    2) if it's shutting down like the power went out (no blue screen or freeze) and DOESN'T start up immediately (like a restart) that's pretty standard behavior for an overheat. Typically only an overheating cpu/motherboard or power supply will trigger that (usually overheating gpus simply lock up the system in a freeze). it's possible the high temps would cause power issues, but usually power issues will cause a reboot not a shutdown
  2. ingtar33 said:
    1) 750W is enough for that build
    2) if it's shutting down like the power went out (no blue screen or freeze) and DOESN'T start up immediately (like a restart) that's pretty standard behavior for an overheat. Typically only an overheating cpu/motherboard or power supply will trigger that (usually overheating gpus simply lock up the system in a freeze). it's possible the high temps would cause power issues, but usually power issues will cause a reboot not a shutdown


    Mm. It does start up immediately but that happened one time where I can't start it, with the led lit in blue on JBAT1. I had to turn off the psu and wait a while till the light disappears. that's the easiest option for now. I already ordered some quality thermal compound and will try applying it as soon as I can. Thanks.
  3. ingtar33 said:
    1) 750W is enough for that build
    2) if it's shutting down like the power went out (no blue screen or freeze) and DOESN'T start up immediately (like a restart) that's pretty standard behavior for an overheat. Typically only an overheating cpu/motherboard or power supply will trigger that (usually overheating gpus simply lock up the system in a freeze). it's possible the high temps would cause power issues, but usually power issues will cause a reboot not a shutdown


    The thread has been updated and I have narrowed down the problem.
    It's definitely not my Graphics card, because I took it out and using it now on my old computer.
    thanks for your response so far
  4. have you tried another power supply?
  5. ingtar33 said:
    have you tried another power supply?


    Yes, I have updated the thread mentioning it.
    -I tried buying a new power supply, Seasonic ss760XP(platinum-760). that's where I found out that my Corsair RM750i isn't broken after all.
    It shows the same exact problems.
  6. Best answer
    manuelberja said:
    ingtar33 said:
    have you tried another power supply?


    Yes, I have updated the thread mentioning it.
    -I tried buying a new power supply, Seasonic ss760XP(platinum-760). that's where I found out that my Corsair RM750i isn't broken after all.
    It shows the same exact problems.



    hmmmm... only a couple of things left could be the cause. Lets eliminate them.

    1) download and install the latest bios for your motherboard
    2) manually inspect the ram timings, make sure the XMP profile is properly detecting and setting up your ram
    3) download and install latest drivers for motherboard
    4) make sure your windows version is up to date
    5) perform a virus scan with malwarebytes

    If you're still having issues you might be overheating "somewhere"
    -pop the side of your case off and stick a room fan in the openning, blast it on high and see if the problem comes back, if it doesn't SOMETHING is overheating and you'll have to investigate what that is

    If you're still having issues there might be a windows problem
    -wipe your hard drive and try to install windows again

    If all of this doesn't work I'd probably return your motherboard as faulty and try another motherboard.
  7. One of my suspicions were the motherboard, so I bought a new motherboard, installed it and now it is running for over 48 hours straight.
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