Computer periodically loses power

[Arkanzier]

Every couple days or so my computer will suddenly lose power for no obvious reason, the screen will just go black and I'll hear the fans stop spinning. At first I thought it was  temperature related, since my processor was sitting at 55-60C idle, but nothing has gone over 70-80C with what I've been doing lately so it's probably something else. This build was fine for about 7 months and then this just started without warning about a week and a half ago. I didn't change the hardware or BIOS before that, and I don't remember doing anything in software that might cause this.

 

Windows 10 x64

Gigabyte x570 Aorus Elite (latest BIOS as of a couple days ago, no overclocking except XMP)

Ryzen 7 3800X with stock cooler (Wraith Prism, I believe)

G.Skill Ripjaws 2x16GB at 2133 MHZ

Some other memory from I don't remember what brand 2x8GB at 2133 MHZ

Nvidia GTX 970

EVGA SuperNOVA 80+ gold 850 watt PSU (I did buy this in 2015, is it possibly going bad?)

[piratemonkey]

Do you ever have brownouts (room lights will dim for a second or two)?

[Arkanzier]

5 minutes ago, piratemonkey said:

Do you ever have brownouts (room lights will dim for a second or two)?

Nothing obvious, but this place was built in the 70's (and I assume the wiring hasn't been updated since).

[piratemonkey]

11 minutes ago, Arkanzier said:

Nothing obvious, but this place was built in the 70's (and I assume the wiring hasn't been updated since).

It might be the PSU, especially if you game a lot, or do something like mine or fold

[Arkanzier]

8 minutes ago, piratemonkey said:

It might be the PSU, especially if you game a lot, or do something like mine or fold

I do game a lot. Is there a decent way to tell, short of buying a new one and trying it, given that I don't have the proper tools?

[piratemonkey]

4 minutes ago, Arkanzier said:

I do game a lot. Is there a decent way to tell, short of buying a new one and trying it, given that I don't have the proper tools?

I don't think. I certainly don't know how

[Arrogath]

having the windows crash logs to know exactly what sort of crash/interruption would be good. I checked out this post because I was having a random power cut issue with the Asus Crosshair VIII Formula that was BIOS related, not PSU related. I don't remember hearing about the same issue from your motherboard but it could be worth looking into

I would be suspicious of the odd memory setup, instability with mismatched memory isn't unusual

[Arkanzier]

7 minutes ago, Arrogath said:

having the windows crash logs to know exactly what sort of crash/interruption would be good. I checked out this post because I was having a random power cut issue with the Asus Crosshair VIII Formula that was BIOS related, not PSU related. I don't remember hearing about the same issue from your motherboard but it could be worth looking into

I would be suspicious of the odd memory setup, instability with mismatched memory isn't unusual

All the Windows logs will tell me is "the previous system shutdown at (time) on (date) was unexpected," so not much beyond it most likely being a hardware issue.

 

I did have a similar issue with a previous computer that was BIOS related, but that was because I'd gone in and tweaked a bunch of settings trying to fix another issue (Windows dropped the power to my CPU to the minimum possible, that was fun trying to identify). I suppose it's worth resetting the BIOS settings and taking out the smaller RAM sticks just to be sure, but I put the second set of RAM sticks in 5 months ago with no issues until recently, so that seems unlikely.

[Arkanzier]

I replaced my power supply and it's now been 5 days with no issues, looks like that's fixed it.