Computer Randomly Shutting Down

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So I have quite an issue on my hands. My recently built (this past June) computer will sometimes shutdown randomly while playing graphic intensive games (Final Fantasy XIV/ Battlefield 4). When it shuts down it doesn't blue screen, it just dies. Once shutdown sometimes it won't start up for some time (10 minutes or so). My specs are as follows:

CPU: Intel i7 4770k @ 3.50 GHz
CPU Cooler: Cooler Master Hyper 212 Plus
GPU: ASUS DirectCU II GTX780ti
RAM:Corsair XMS3 16GB (2 x 8GB) DDR3-1600 Memory
MOBO: ASUS Z-87 Pro
SSD: PNY XLR8 240GB
HDD: Toshiba 2TB 7200RPM
PSU: Corsair HX 850W
Case: Antec 1200 V3
Monitor: ASUS @144Hz

I don't believe it is my PSU. Previously, I had a XFX Proseries 750W and I thought that was the issue so I switched it to the one above. Also, I completely reinstalled the Nvidia drivers for the GPU because I heard that might be the cause but that didn't solve it.

The weird thing is I have tried stressing my GPU, CPU, and RAM and none of the tests caused a fail. My case is clean and all the fans are running smoothly. While doing the tests my GPU never got above 71C (for FurMark test) and my CPU never got above 72C (for the Prime95 test). I plan on re-running these test and posting the results and whether or not it shutdown. Any help is greatly appreciated, thanks!

****EDIT****
I added a post below detailing what my problem was and what the actual solution was.

 
Solution
W

A PSU is only one part of the power system. A power controller decides when to power off, power on, and even when the CPU is permitted to operate. To say more that is useful means you need a digital meter and some instructiions. What follows in the reply is a list of what is suspect and what is good. Without using the expression "It might be".

Without numbers from six wires, then every reply can only be "did you try to..." Required are numbers that define what the power controller sees and what it is doing. That means about one full minute of labor...
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HyNrgy

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does it die after a certain amount of time running the games? I ask because if it dies right about 30 minutes in (and not sure when you ran temp test on devices if it was durring stress test) do the test again say right about 25-27 minutes (mean play for 25-27, stop no matter where are in game and imediately run test and if possible do so while just hitting windows key (minimizing the game but still running so if is stressing machine will not allow time to cool down and should stay runing))
 
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It never dies at the same time. For example, this morning it died after 7 minutes of in game time (Final Fantasy 14). But then once my comp restarted and I reconfigured the monitoring software to log the data, I started the game again and it has been running for 3 hours without any problems. I have been periodically checking the temps (using the windows key) and my GPU has never been above 64C and my CPU has never been above 50C (it usually averages 45C with a max of 50C). I'm baffled because it is so inconsistent.
 
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HyNrgy

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going back to original post, when you say sometimes it will not start up for 10 minutes, when you hit the power button does the power button or anything light up and just not fully start or boot or dead? Does your psu have a indicator light in the back?

Have you thought of using a plug that displays volt/watt drawn to plug into outlet and then pc into it. Monitor display to see if how it is drawing power

off the wall idea, do you have it going through a surge protector or power strip? Have you changed/swapped that out?

Forgive if not finding issue but things like ram problems would generally cause a BSOD but since options are dwindling have you ran a full memory test like memtest86 and put it though the works
 
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Unfortunately, there isn't any indicator lights on my PSU. But when it dies the standby power lights on the motherboard and the GPU remain on. When I press the power button it never gets to boot. No components turn on. After some amount of time it will just start up as it would normally. The amount of time it takes to start up always varies. Sometimes it will be 10 seconds, other times it has been close to 10 minutes.

I haven't used a plug to display the volt/watts being drawn. But I think that might be my next step.

Currently I have it plugged into a power surge. When it entered this dead state and wouldn't turn on I plugged it directly into the wall. However, it still wouldn't turn on.

I have run memtest86 for about 7 hours but it was a while ago. I will run it again tonight and post the results tomorrow if/when it finishes.

 
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HyNrgy

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I admit i am comming to a roadblock in my mind. From what you have stated it almost seems like either the power button itself or something is doing a failsafe trying to prevent fatal problems but I cannot put my finger on it (serious and pun intended). If it only happens when running game intensive (graphics intensive) games that generally means computer is running full on. i was thinking to try a different graphics card but i do not remember or see how that would make computer not even turn on. Also, recheck all power and grounding connections from start to finish, could be a faulty connection somewhere
 
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westom

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A PSU is only one part of the power system. A power controller decides when to power off, power on, and even when the CPU is permitted to operate. To say more that is useful means you need a digital meter and some instructiions. What follows in the reply is a list of what is suspect and what is good. Without using the expression "It might be".

Without numbers from six wires, then every reply can only be "did you try to..." Required are numbers that define what the power controller sees and what it is doing. That means about one full minute of labor with a meter.
 
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Solution
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The problem was the Motherboard. After running all RAM/CPU/GPU tests I could find I finally resolved to send in my graphics card. I got a different, refurbished, version of the card I was using. After installing the new GPU into my computer I tested again. The results were the same. My computer would still shut down. I decided that maybe it might be a faulty motherboard where perhaps a connection was being disconnected when it was heating up. So I purchased the same motherboard, installed it, and have had no problems since. Thank you all for your help!
 
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