Computer turns off after playing tf2 for 10 minutes?

[LordRascus]

So, I recently built a pc, and its been working flawlessly up until now. I first noticed it after playing Team Fortress 2 for about an hour. The computer just shut itself down, I immediately tried to turn it back on, it began to boot and then turned off again after about 3 seconds (this part scared me). Could something be malfunctioning already after being built just 2 months ago?

PC Specs:

CPU: i7 6700K
CPU Cooler: Corsair H100i GTX
Motherboard: Asus Z170-AR
GPU: Gigabyte Windforce GTX 580 (Has a 8 pin + 6 pin to power it)
PSU: EVGA Supernova 750 Gold
Case: NZXT S340

I'm wondering if some component is overheating (which would be strange if it was the cpu as it has such a good cooler). Is it possible that the 750 psu can't support the gpu? (Although I thought 600W was the min. Please help! D:

 

[Crapcicle]

The recommended wattage for a 580 build is 600W so it definitely isn't the power supply. Sounds more like either an overheating issue or RAM failure. One of your connectors might have just been unplugged too. Recheck your connections. Do you have an older PSU you can test your build with to make sure it isn't the PSU failing? I doubt it is the PSU though because the supernova line is a very reputable one.

 

[LordRascus]

The recommended wattage for a 580 build is 600W so it definitely isn't the power supply. Sounds more like either an overheating issue or RAM failure. One of your connectors might have just been unplugged too. Recheck your connections. Do you have an older PSU you can test your build with to make sure it isn't the PSU failing? I doubt it is the PSU though because the supernova line is a very reputable one.

Well, I was playing Civilization IV for a good 2 and a half hours, and I had no trouble. As soon as I lauched team fortress 2, and played it for around 5 minutes, it switched off! I pulled the power cord out, then plugged it back in. Motherboard lights came one, but the pc didn't start. So I opened up the case, and made sure the 8 pin + 6 pin vga connectors were seated, and they were, how can I check if its the ram? And why did it run Civ 4 for so long but tf2 for only 5 minutes?

Oh, and I forgot to mention. This only started happening when I updated my Windows 10, could that be a problem?

 

[LordRascus]

I think I may have found something that may be useful. The pc seems to turn back on by itself after it shuts down. When I walked back into my room it was already going. Anyway I went to check out the temps I got when playing a game, when I accidentally bumped my pc and it turned off. After a few seconds it turned itself back on, I tried gently rocking it side to side, and again, it turned off. I have no idea if that is normal but I haven't noticed it before, could something be loose? But that wouldn't make sense as it turns itself back on?

 

[Crapcicle]

Might be a loose power connector. Could explain the rocking turning the PC off.

 

[Vic 40]

Just check every connection from the psu,also at the psu side.
Make sure that the cooler is well attached.
Maybe also reseat the gpu and ram to make sure they are well seated.