Question I'm thinking the PSU is the problem?

[Thunder 57]

For a little while now my PC has been doing completely random reboots. No blue screen, no warning, nothing seems to trigger it, totally random. I tried resetting PBO to default and ran memtest86 with no errors and the problem has not gone away. I am using a 650W Seasonic PSU that I got in late 2018. I think it is just starting to fail. I can play games or run stress tests OK so it doesn't seem to be a load problem. Just browsing the web is enough. It is still under warranty, I am just asking for any suggestions anyone might have or something I may have overlooked.

I do tend to use PSU's until they die. The last one I had in this rig was a Cooler Master I believe. It worked well until it would randomly cut power when under heavy load. I've never seen a PSU just flake out at pretty much idle though, it just seems odd. Here is how it shows in Event Viewer:



I know this subforum doesn't get the most attention but if anybody is out there and has an idea I'd like to hear it! Thanks in advance.

 

[In2Photos]

My experience with instant black screens/reboots is usually PSU, but it could be the motherboard. Any chance you have a spare PSU laying around just to test? I never had one until my son's first build had a bad Corsair RMx650. After a week or so of running it just started black screening and rebooting. Picked up a PSU locally to test and it ran fine so we used it until his replacement came in. I decided to hang onto the spare after that.

Unplugging all non-essential items from the motherboard would rule out any peripherals causing the issue.

 

[mikeymikec]

PSUs can cause odd problems

Example:

Question - New build, random BSODs in Win11 23 or 24H2, with updates or none

Spec: AMD 4300G 8GB Kingston Fury DDR4-3200 RAM Samsung 980 PRO 1TB (latest firmware) Corsair CX500 PSU DVD drive MSI B550M-PRO-VDH (latest BIOS) It's a spec I've used a number of times before without issue, but this time I'm getting BSODs I think almost exclusively when the computer is idle...

forums.anandtech.com

At face value though the spontaneous reboot symptom you mentioned could be just about anything. Do you have auto reboot on BSOD disabled?

Also it seems premature for a decent quality brand PSU like that to die. I'd check the warranty length as the Focus GX's I've bought in the last few years had 10-year warranties on IIRC.

 

[Thunder 57]

Yes auto reboot is disabled. Even then I would expect something to show in the log. It is a good brand that is why I wanted to ask if I am missing something. It is under warranty (forgot to mention that). I don't have a spare laying around so I'd have to go find one to borrow which seems like more trouble than it's worth when I could just RMA it.

 

[Steltek]

You haven't overlooked anything.

Were that my system I'd be replacing the PSU as soon as possible, as all the testing you've done to date supports that the PSU is failing.

And, looking at the frequency of log entries, the problem is clearly getting significantly worse over time. You are better off replacing it now, rather than chance it deciding to catastrophically fail (and take the motherboard, CPU, and/or video card with it).

Statistically, even great PSU brands like Seasonic or Corsair will sell a marginal unit here and there. It sounds like you unfortunately drew the short straw in this instance.

 

[Thunder 57]

You haven't overlooked anything.

Were that my system I'd be replacing the PSU as soon as possible, as all the testing you've done to date supports that the PSU is failing.

And, looking at the frequency of log entries, the problem is clearly getting significantly worse over time. You are better off replacing it now, rather than chance it deciding to catastrophically fail (and take the motherboard, CPU, and/or video card with it).

Statistically, even great PSU brands like Seasonic or Corsair will sell a marginal unit here and there. It sounds like you unfortunately drew the short straw in this instance.

Yes especially since I was away for a bit between 9/22 and 10/1. Every time it happens I worry about my hard drives, they don't like sudden power loss. But yes it can really take anything with it.