Newly built PC shut down and will no longer turn on

[Magnusbbc]

Hello Everyone

I have recently built my first desktop pc with the following specs:

• 
  -Power Supply: SEASONIC M12II BRONZE 750 750W 80 PLUS BRONZE
  -SSD: ADATA SSD SP600 128 GB 2.5
  -HDD: SEAGATE 1TB HDD DESKTOP 64 MB SATAIII 7200RPM 2R
  -GPU: MSI GTX 970 GAMING 4G
  -mobo: GIGABYTE H170N-WIFI (REV. 1.0)
  -RAM: DDR4 CRUCIAL 8GB 2133MHZ CL15 1.2V, DUAL RANK
  -CPU: CPU INTEL CORE I5-6600 BOX (3.3GHZ, LGA1151, VGA)
  -Cooler: Corsair H55
  -Case: bitfenix prodigy

However, after the initial setup process I decided to try and play some games and after about 30 minutes it just randomly shut down. I restarted it and immediately made sure to download all drivers imaginable. I tried to play some more video games, but eventually (this time after 2 hours) it shut down again (GPU temps around 75 C and CPU around 55). The computer has repeated to do this under heavy load (sometimes it is after 5 minutes of gaming, other times many hours) these last couples of days and at this point it is really getting on my nerves and I am worried that I might cause permanent damage to my hardware, however I have run out of options and have no idea of how to approach the problem. Can any of you guys help me?

Thanks in advance

 

[Grimwinder]

Is that RAM one stick, or two? If it's two, try taking out one and testing the PC with each one separately. Also, make sure your CPU cooler is seated firmly, as I don't see the LGA1151 socket as being listed for compatibility on Corsair's page.

 

[Magnusbbc]

Is that RAM one stick, or two? If it's two, try taking out one and testing the PC with each one separately. Also, make sure your CPU cooler is seated firmly, as I don't see the LGA1151 socket as being listed for compatibility on Corsair's page.

The cooler should not be an issue (LGA 1551 cooler should be compatible with 1550) and it is consistently running very low temperatures. However I haven't thought of the RAM and will try to check that now

 

[reedo_43]

Ram will not cause a shutdown. It is either heat, a bad mb or psu.

 

[Magnusbbc]

Ram will not cause a shutdown. It is either heat, a bad mb or psu.

It doesn't seem to be heat (before shutdown, cpu temps are usually at about 50-60 C and GPU is at 65 -75 c)

How would I go about identifying a faulty mobo or psu?

 

[reedo_43]

unfortunately, the only way is to swap them out.