PC Randomly restarts please help!

[RayW718]

Hey everyone, I’ve been dealing with this issue for a few weeks now and I’m running out of ideas on what’s causing it.

and im running out of ideas to whats been causing this.

The Problem:

It all started when my monitor randomly broke. After replacing it, I noticed my PC wasn’t outputting any display. The debug LED was stuck on CPU (I’ve had this before — reseating RAM and clearing CMOS fixed it). That worked again… but now the system randomly restarts, whether I’m gaming or just watching YouTube.

Background Info:

A few months ago, I had an issue where enabling XMP/EXPO caused my PC to crash or restart. Turning XMP off fixed it for a while, but now even with default BIOS settings, it’s restarting again.

What I’ve Tried:

• Reseated CPU and RAM

• Cleaned the entire PC

• Replaced CMOS battery

• Updated BIOS

• Reinstalled drivers

• Checked Event Viewer → shows Event 41 (Kernel-Power)

Each time I try something, it seems to work for a few hours or days… then the random restarts come back.

Specs:

• CPU: Ryzen 5 5600

• Mobo: MSI B450M Mortar Max

• GPU: GTX 1060

• RAM: Crucial Ballistix 16GB (2x8GB) 3200 MHz

• PSU: Seasonic m12ii evo 620w

• Storage: Teamgroup 256GB M.2 SSD + WD Blue 1TB HDD

Unfortunately, I don’t have spare parts to test with, so I’d really appreciate any advice, possible causes, or similar experiences anyone’s had. Thanks!

[Sawa Takahashi]

I think you should check your temps (CPU and GPU) to see if you have thermal issues. That could be a simple fix like changing thermal paste.

You can use free software like GPU-z or HWinfo64 to monitor your temps (and voltages while at it) to see if this is the problem.

[MadAnt250]

11 minutes ago, RayW718 said:

PSU: Seasonic m12ii evo 620w

Seems like a dying PSU in my opinion.

[RayW718]

2 hours ago, Sawa Takahashi said:

I think you should check your temps (CPU and GPU) to see if you have thermal issues. That could be a simple fix like changing thermal paste.

You can use free software like GPU-z or HWinfo64 to monitor your temps (and voltages while at it) to see if this is the problem.

Temps are normal, just replaced thermals when I reseated everything

[RayW718]

1 hour ago, MadAnt250 said:

Seems like a dying PSU in my opinion.

That's what im thinking too, just getting some info before determening if its actually a PSU problem, might as well try to see what others have to suggest, will try to replace the PSU soon

[Sawa Takahashi]

1 hour ago, RayW718 said:

Temps are normal, just replaced thermals when I reseated everything

What about the voltages ?

 

And I agree with the other poster that testing with another PSU would be a good test.

[RayW718]

On 10/28/2025 at 3:18 AM, Sawa Takahashi said:

What about the voltages ?

 

And I agree with the other poster that testing with another PSU would be a good test.

They look pretty normal no? thats just idle at the moment tho

[BrokenGodOfSleep]

Hello,

 

I had randome restarts. It was RAM.

Did you already ran memcheck ?

Build in windows tool to check your RAM.

 

I recommend running it with one Stick at a time.

 

The probability is low but you never know.

[RayW718]

46 minutes ago, BrokenGodOfSleep said:

Hello,

 

I had randome restarts. It was RAM.

Did you already ran memcheck ?

Build in windows tool to check your RAM.

 

I recommend running it with one Stick at a time.

 

The probability is low but you never know.

I've done the built in windows memory diagnostic and memtest, I honestly thought it was the RAM too but from the few times I tried troubleshooting it it still randomly crashes 

[Sawa Takahashi]

9 hours ago, RayW718 said:

They look pretty normal no? thats just idle at the moment tho

I'm not sure about Vcore because there are few utilities to report it accuratly.

But I'm really confident that your +5V is way too low. 4.9V would be bordeline low, 4.4V is literally starving all your 5V devices like USB, SSD and wifi adapters. This can certainly cause a reboot.

I advise to test your voltages again using another Power Supply. There is still a chance that the sensors are wrong and the +5V rail is closer to 5V, but the PSU is a real suspect here.