PC shut off mid-game and will not turn back on.

[imnofanboy1996]

EVGA SuperNOVA 750 B1 80+ BRONZE, 750W
G.SKILL AEGIS 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3L 1600
EVGA GeForce GTX 970 4GB SSC Gaming ACX 2.0+ Cooling Graphics
MSI Intel Z97 LGA 1150 DDR3 USB 3.1 ATX Motherboard (Z97 PC Mate)
Intel Core BX80646I74790K i7-4790K Processor (8M Cache, up to 4.40 GHz)
Thermaltake Frio Silent 14 165W Intel/AMD 140mm CPU Cooling Fan

I built this rig about 14 months ago and have not a single problem with it prior to this. I haven't tried anything new with my setup or placement of the pc or components since day 1. The only times I've taken it apart were to clean it periodically. The other day during a game of Titanfall 2 everything just went black. No stutter, no freeze, error, no warning at all. Just mid game -> black screen. The one thing I noticed was the keyboard and mouse LEDs were still lit for 15-30 seconds after the screen blacked. My first guess was the PSU was bad but 2 days and a brand new PSU later no change. Now there is absolutely no response. I press the power button and absolutely nothing happens. No lights, no fans, no screen, nothing. I'm strapped for cash until next week and I'm pretty desperate to have this thing working again ASAP. If I have to wait and see a professional I'd at least like to try this approach in the meantime. Unfortunately, as I said before, this is my first real issue with the machine and it is my very first build so I truly have no idea where to start. Any help with the troubleshooting process would be greatly appreciated. Thank you for your time.

 

[Sedivy]

If there is absolutely no response when you press a power button. no lights, no fans, nothing, that would again point to the psu.
However, it's worth going through the troubleshooting checklist point by point. Skip points where you haven't touched anything since this happened. Like...mobo standoffs. Or cables you haven't unplugged or touched. But check as many points as you can:
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

 

[imnofanboy1996]

I'm such a novice; I'm just going to take the day to disassemble and reassemble each checkpoint, any progress and I'll repost. I'm investigating the mobo placement first and from there I'm just going to have to check every connection because I know the PSU is brand new and wired correctly. Thank you for your help

 

[Sedivy]

Don't stress, it happens to everybody. I lost count how many times I had to re-check, re-plug and re-mount things, even during assembly and especially during troubleshooting. Just watch for static, touch the metal of the case as often as you can before you touch any components.

 

[Snorlord]

If there is absolutely no response when you press a power button. no lights, no fans, nothing, that would again point to the psu.
However, it's worth going through the troubleshooting checklist point by point. Skip points where you haven't touched anything since this happened. Like...mobo standoffs. Or cables you haven't unplugged or touched. But check as many points as you can:
http://www.tomshardware.com/forum/261145-31-perform-steps-posting-post-boot-video-problems

Not necessarily, I had the same when a gpu of mine died. Would not start, not even the lights would turn on. When replacing gpu woops everything starting again like normal.

 

[Sedivy]

Hmm well typically fans should at least start, definitely on the psu, and for a few seconds on the case as well. If you hear none of that, then it's more likely it's the psu. Then there's the tiny error led lights on the mobo that should light up (depending on the mobo type), beeps (depending on the presence of mobo speaker) and so on. If the cpu or mobo support integrated graphics, loss of gpu would trigger switch to that, though in some cases gpu needs to be out first.
But again, it's good to be thorough so that's what the troubleshooting checklist is for.

 

[Snorlord]

Hmm well typically fans should at least start, definitely on the psu, and for a few seconds on the case as well. If you hear none of that, then it's more likely it's the psu. Then there's the tiny error led lights on the mobo that should light up (depending on the mobo type), beeps (depending on the presence of mobo speaker) and so on. If the cpu or mobo support integrated graphics, loss of gpu would trigger switch to that, though in some cases gpu needs to be out first.
But again, it's good to be thorough so that's what the troubleshooting checklist is for.

Well the psu was not running either. It was like the psu locked himself in some safe mode to not short circuit.

 

[Sedivy]

That's rather odd. PSU should function no matter what. Mobo may refuse to continue startup because of components not functioning but the psu fan should come on.
I don't know what model that psu you had is, maybe something particular about it, but it's not usual case during startup. Checklist will address this though if he follows it so it doesn't really matter.

 

[Snorlord]

That's rather odd. PSU should function no matter what. Mobo may refuse to continue startup because of components not functioning but the psu fan should come on.
I don't know what model that psu you had is, maybe something particular about it, but it's not usual case during startup. Checklist will address this though if he follows it so it doesn't really matter.

I think it was a be quiet! Straight Power E9. Best psu I ever had. Up until today still working and running my server now.

At the time I also thought like you it was my psu so I replaced it with a new psu. But that one must have been not so good as the E9. Because indeed my fans started and leds turned on but it ignited my gpu and almost burned my motherboard and other components...

Well both psu's are still running well today. But I don't trust the new one I bought as much as the older one.

 

[Sedivy]

Because indeed my fans started and leds turned on but it ignited my gpu and almost burned my motherboard and other components...

Holy crap.....never seen that admittedly. Is there something about current or wiring where you are? Because psu is supposed to kick in and shut off the circuit (at least most better newer models are) if there's that much instability. I mean I've fried my mobo and gpu in a similar manner long ago with a shitty psu, but there was never any actual burning. They just died.

 

[Snorlord]

Because indeed my fans started and leds turned on but it ignited my gpu and almost burned my motherboard and other components...

Holy crap.....never seen that admittedly. Is there something about current or wiring where you are? Because psu is supposed to kick in and shut off the circuit (at least most better newer models are) if there's that much instability. I mean I've fried my mobo and gpu in a similar manner long ago with a shitty psu, but there was never any actual burning. They just died.

Hmm not that I know off, wiring should be decent here. I think it was just the newer psu wasn't provided with a safety against it. When everything turned on gpu got a long flame on the side. Lucky I was quick enough to turn the psu off, only my side panel burned a bit and I had a shielded sound blaster z hanging above the gpu that blocked the flame. Only the shield was burned black. But the sound card still worked fine.