Computer randomly shutting down

[Rebyul]

Hey guys, looking for a bit of advice.
My computer started dying randomly 2 days ago: as if the plug has been pulled out.
Then the bios setting to turn it on after sudden AC power loss kicks in turning it back on.
Temps on both the GPU and CPU look fine, in the mid 20s low 30s.
It shutdown anytime between booting into windows (even before the login screen appears) to stress testing.
Furmark kills the computer 99% of the time, there was one instance where it completed a 4k stress test after doing a DDU and fresh install of the nvidia drivers.

Specs:

gigabyte z170x gaming 7 bios f22
6700K reverted to stock speeds
980 Ti Lightning reverted to vanilla bios
evga g2 1000W psu (about 4/5 years old)
16gb ram 2400 cl14 gskill
500g b 860 evo and 120gb 850 pro
2tb harddisk
custom water cooled

windows 10 64bit

I would prefer to avoid taking it all apart cos its a hassle, so I'm looking for ideas until the weekend when I have time to pull it apart.

Get creative

Thanks in advance~

[Fasauceome]

have you reseated your CPU? sometimes the contact isn't perfect with the pins.

[Zmax]

It could be a power supply problem. 

[Rebyul]

have you reseated your CPU? sometimes the contact isn't perfect with the pins.

The system has been working for a couple of years, I am skeptical about this one

[Rebyul]

21 hours ago, Zmax said:

It could be a power supply problem. 

This is what I'm leaning towards.. hmm warranty ran out for my power supply a year ago T.T

[Rebyul]

Just tested with a 550W evga psu, but without the graphics card plugged in as Im wary of its power draw.

Furmark has been running for about 10 minutes off the iGPU, time to walk down to the nearest psu provider?

[Fasauceome]

1 hour ago, Rebyul said:

Just tested with a 550W evga psu, but without the graphics card plugged in as Im wary of its power draw.

Furmark has been running for about 10 minutes off the iGPU, time to walk down to the nearest psu provider?

got a friend's you could borrow?

[ZacoAttaco]

1 hour ago, Rebyul said:

Just tested with a 550W evga psu, but without the graphics card plugged in as Im wary of its power draw.

Furmark has been running for about 10 minutes off the iGPU, time to walk down to the nearest psu provider?

If you think it's stable without the graphics card, then it's either the PSU (like we suspect) or possibly even the GPU, I'd lean towards the PSU though, seems pretty typical to me.

We'll keep troubleshooting but I'm leaning towards PSU.

[Rebyul]

Just went out and bought a new 850w p2 from the local store, works fine!

Kinda bummed that the power supply died after 4 years, I guess it's about time? How long do power supplies last on average?

[ZacoAttaco]

1 hour ago, Rebyul said:

Just went out and bought a new 850w p2 from the local store, works fine!

Kinda bummed that the power supply died after 4 years, I guess it's about time? How long do power supplies last on average?

Glad to hear, PSUs are probably expected to last 4 or 5 years. But, like any PC part, it can fail at any time. To be honest, I'm expecting mine to die by the end of the year. I cheaped out on it back before I knew what I was doing.

[Zmax]

14 hours ago, Rebyul said:

Just went out and bought a new 850w p2 from the local store, works fine!

Kinda bummed that the power supply died after 4 years, I guess it's about time? How long do power supplies last on average?

Glad to hear you fixed it .