As title suggests.
Coming home the other day I find my PC started to restart out of nowhere, with no warning before or errors afterwards.
I haven’t changed anything and haven’t had this problem before.
Any suggestions on what to do?
Device specs:
Processor Intel® Core™ i9-9900K CPU @ 3.60GHz 3.60 GHz
Installed RAM 64.0 GB
Storage 233 GB HDD ST9250315AS, 112 GB SSD OCZ-VERTEX2, 466 GB SSD Samsung SSD 970 EVO Plus 500GB
Graphics Card NVIDIA GeForce RTX 3060 (12 GB)
System Type 64-bit operating system, x64-based processor
OS Windows 10
UPDATE: Memtest got through 2 out of 4 passes in under 4 hours before I got fed up with waiting, which in itself seems a good sign since it didn’t restart there.
Event viewer showed one odd Event:
The process C:\WINDOWS\Explorer.EXE (ANDROID-17) has initiated the restart of computer ANDROID-17 on behalf of user ANDROID-17\smuld for the following reason: Anderer Grund (geplant) Reason Code: 0x80000000 Shut-down Type: restart Comment:
No idea why because automatic restart is disabled.


Is this a new problem?
If so what was the last change made?
Does it happen under heavy load or does it happen when idle or both?
Does the OS restart or it it a total power loss?
Yes a new problem, started just a few days ago. I haven’t changed anything as of late; last one was installing a game about a week or so earlier.
OS restarts, no errors or anything.
If there are absolutely no errors in event log before the restart, PSU really is a top contender. The system will have had no warnings of any kind. If the PSU stops delivering adequate power, it’s likely to restart, and this is at a low level (i.e. the motherboard restarts the system).
It’s difficult to diagnose too. For mine, I was able to get more-or-less consistent restarts by requiring more PSU current by putting the system under heavier load. Once I saw the restarts occur as fans / drives / GPU were spooling up, I swapped my PSU. That was the issue.
The good news is that (well-made) PSUs usually fail in a way that won’t damage components. And yes, even good PSUs can fail, especially if they’re being used above their rating. And even the best PSUs don’t last forever – best practice to change them out every few years, in any event.
Maybe faulty ram? Pull out all ram sticks but one and see if it happens again if it does swap ram sticks until it doesn’t.
If that doesn’t solve it it may be a failing PSU or other major component like the GPU or HDD.
A good starting point is removing everything not needed to boot and slowly adding them back again until it fails.
Those were my ideas as well. Here’s hoping it’s the RAM because I could work with less and don’t have the money for a PSU replacement.
Yeah, PSU is my top guess based on what all you’ve said. My next step would be to swap to a test PSU to see if it behaves, but since that’s not an option for you now, testing the other things people have suggested is worth a shot and can’t hurt.