System reboots consecutively and in shorter intervals

[Fernando_11]

Build:
PSU Corsair TX750
CPU Intel core i7 4770k
MoBo Asus Maximus VI Impact
GPU NVIDIA Geforce GTX 770
RAM 2 Corsair Vengeance Pro Series 2x8GB

I've been having a serious issue that appears to be getting worst every time I true to fix it.
2 days ago my CPU went black screened with occasional blinks, as if it was trying to load something. After that, I restarted windows 10 and it wouldn't work, showing those troubleshooting screens asking if I wanted to restart or try to restore windows.
Next morning I tried again, it worked fine for about 10 mins and same thing happened. This time I noticed while rebooting, it wouldn't even pass bios screen, so I figure it's a hardware issue.
Cleaned all the parts and tried to use one memory alone, it did work longer for about 40 mins and the same problem again... Which made me think it was a temperature issue, but CPU and GPU are not overheating. The PSU on the other hand is running wit you it's fan, but I've read the TX750 has fanless mode? The PSU doesn't feel hot when I touch it.
Even though nothing appears to be overheating, after long iddle times it seems that I can use the PC for a short period of time, until this rebooting issue starts. And for every consecutive reboot, the next reboot whill happen faster (like after the first reboot I still can enter windows, the second will happen before I can type the password, the third won't even pass bios screen, and the it just doesn't show anything anymore.
Any suggestions would be most welcome!

 

[DRagor]

Most likely PSU or motherboard issue. I would start with testing another PSU.

 

[Fernando_11]

Most likely PSU or motherboard issue. I would start with testing another PSU.

Thanks for the reply, that will be my first attempt. But, since I don't have another PSU, is there a way of having the PSU I've got tested, instead of testing the system with another PSU?

 

[DRagor]

You can put your PSU in another comp; if it is faulty it would give similar reaction.

 

[Fernando_11]

Well, today I took the PSU to a shop and apparently everything is fine with it. They tested in a motherboard with a CPU, tested the voltage, and tested the cooler.
They didn't actually plugged in a PC with monitor though... Also, they said it could be a problem with the memory or the GPU. I'll try now to use the onboard GPU, and also clean the memory slots and cards.
If the problem persists, how can I make sure that the problem is the motherboard?

 

[DRagor]

100% sure - only by swapping component.
As for ram, it would be good to run memtest on them, but it usually takes at least 2 h, so I doubt if you can keep to working long enough. However faulty ram usually gives BSODs, not reboot problems.
GPU - in theory it could cause this, although unlikely, but sure it's worth trying using only iGPU, just to remove one component from suspect list.
You can check your motherboard visually for any kind of damage, like bulged capacitors or anything looking unusual. Also check if cooler is not over-tightened.

 

[Fernando_11]

Well, I'm writing from my PC and it's been well over an hour since I turned it on. I tried different things so i'm not sure what was the issue (or is, let's hope not).
I thoroughly cleaned the RAMs and the RAM slots once more, cleaned the motherboard with a brush, cleaned the PSU and HD plugs on the motherboard and plugged them again, and unscrewed the CPU cooler a tiny bit. I'm also running the PC with the onboard GPU and only 1 RAM stick.
I guess the obvious would be that my GPU is busted right? I'll try to plug it in again and install the new drive I've just downloaded.
But one thing i got supicious was the fact that my CPU temperature reached 70ºC while trying to install the new drive (it didn't work cause the GPU is missing), is that temperature normal for such usage? I was also transfering files to an external HD.
If I have an CPU temp issue, could this be agravated by having a more demanding GPU?

 

[DRagor]

CPU temp - depending on cooler, but 70 is nothing alarming, and file transfer can put a bit of strain on CPU.
The level of GPU will have nothing on CPU temp, only CPU load can increase CPU temp.

 

[Fernando_11]

Well, fun is over... After 2 hours of usage it downed on me again, during file transfer. Wasn't watching temps when it happened but after the reboot numbers altered like crazy from 15C to 60C on the motherboard display located at the back panel.
I guess I'll have to test the motherboard... Could be a contact problem between the CPU and the water cooler?

 

[DRagor]

LoL, the 2 digit display at back panel is not showing temps, it is Q-code display that shows error code during boot. Those numbers are supposed to spin like crazy during boot.

 

[Fernando_11]

LoL, the 2 digit display at back panel is not showing temps, it is Q-code display that shows error code during boot. Those numbers are supposed to spin like crazy during boot.

Oops my mistake, they matched the CPU temps every time I checked so I figured...
About the paste thing that connects the CPU with the cooler heatsink, unlikely to be the problem?

 

[Fernando_11]

Hello again, I haven't been able to test the motherboard yet, since I've got no place nor spare parts to do it at the moment, but it seems that if I only run BIOS (I didn't start windows today) the PC will not reboot.
Is it possible to draw any conclusions from it? Could it be a bad drive issue or a corrupted HD, or a corrupted OS?

 

[Fernando_11]

Also, if it is a faulty motherboard, wouldn't it crash on me even while running BIOS?