Computer suddenly shuts off

[n8lbs10]

It just completely shuts off, no blue screen or error messages. It then restarts, sometimes making it back to the home screen before restarting again, but it also may go into a fit of starting up and shutting back down every 2 seconds which is when I normally flip the switch on the PSU to completely shut it off. If I leave it off for around 5 minutes the computer runs about 10 hours with no problems before shutting itself down. My temperatures look fine, everything in the low to mid 30s while idle/just on the internet. Only been playing NBA 2k17, and my CPU hovers around in the mid-high 50s and GPU around 50c while playing. I ran the Windows Memory Diagnostic, came back with no errors. I don't hear any noises, don't smell anything burning. Nothing in the Event Viewer.

I built the computer in late January (all parts new), have had no other problems so far.

Specs:

OS: Windows 7 Ultimate 64-bit SP1
CPU: Intel Core i7 6700K @ 4.00GHz
Motherboard: MSI Z170-A PRO (MS-7971) (U3E1)
RAM: 16.0GB Dual-Channel Unknown @ 1066MHz (15-15-15-36) (2 8GB DD4 sticks)
GPU: 4095MB NVIDIA GeForce GTX 1070 (PNY)
Monitor: Acer X223W
SSD: 111GB PNY CS1311 120GB SSD ATA Device (OS installed on it, 22.1 GB of free space)
HDD:1863GB Seagate ST2000DM001-1ER164 ATA Device (983 GB of free space)
PSU: SeaSonic G Series SSR-550RM 550W ATX12V / EPS12V 80 PLUS GOLD

I only have headphones, a wireless mouse+keyboard, and a PS4 controller plugged into the computer.

From what I've read, it's either the PSU or the motherboard. Can anyone give me some insight on how to definitely single out what is wrong?

 

[Corey Martin]

Try booting into safe mode and seeing if the same thing happens. Also try going into the BIOS setup and leave it idle to see if it still reboots.

 

[n8lbs10]

This time it took 6 hours to shut down, it cleanly restarted itself and I let it sit on the BIOS for ten minutes. Went into safe mode, nothing happened. It's been running on the desktop for the past 30 minutes now with no hiccups.

 

[Corey Martin]

This time it took 6 hours to shut down, it cleanly restarted itself and I let it sit on the BIOS for ten minutes. Went into safe mode, nothing happened. It's been running on the desktop for the past 30 minutes now with no hiccups.

That could possibly mean one of the drivers you have installed are corrupted, or the graphics card could be the issue. Try removing the GPU and booting the PC to see if the same issue occurs. If so, update your drivers for all your components (in safe mode)

 

[n8lbs10]

I was gone all day yesterday with the computer shut off. Today it ran for 8 hours without the GPU before I decided to put the GPU back in. Uninstalled my GPU driver, ran Display Driver Uninstaller, and reinstalled the driver. Updated chipset driver, ethernet driver, audio driver. Updated my LAN card driver (Asus PCE-N15 11n wireless card). Also, while I was in safe mode I ran Malwarebytes and it picked up two trojan.agent.wr viruses, I quarantined and deleted them. Currently running normally for 30 minutes, will keep monitoring to see if it shuts down again.

 

[Corey Martin]

I was gone all day yesterday with the computer shut off. Today it ran for 8 hours without the GPU before I decided to put the GPU back in. Uninstalled my GPU driver, ran Display Driver Uninstaller, and reinstalled the driver. Updated chipset driver, ethernet driver, audio driver. Updated my LAN card driver (Asus PCE-N15 11n wireless card). Also, while I was in safe mode I ran Malwarebytes and it picked up two trojan.agent.wr viruses, I quarantined and deleted them. Currently running normally for 30 minutes, will keep monitoring to see if it shuts down again.

Just as an update, is it working now?

 

[n8lbs10]

It shut down again around 1am, but it hasn't since then, about 16 hours crash free.