Power supply diagnostics

[szymonadamus]

Hi.

My PC has been resetting for a while. Completely without any pattern.

 

I did a little stress testing and finally, using the OCCT 7.3.2 program, I managed to find out that it is most likely the fault of the power supply. OCCT has a test that checks the maximum power load of the computer and after turning it on the PC always restarts itself. It does not restarts itself when stress testing only the GPU or CPU.

 

Do you know any other testing program I can use to test the power supply, motherboard or perhaps cables to be sure that it's in fact the power supply problem? Before sending it to the repair or replacement.

Or maybe you have a other idea what might cause random restarts like this?

 

My current power supply is: EVGA SuperNOVA 650 P2, 650W, 80 PLUS Platinum (220-P2-0650-X2)

 

Full specs:

- ASRock Fatal1ty Z270 Gaming K4, Z270
- Intel Core i7-7700K, 4.2GHz
- MSI GeForce GTX 1080 GAMING X 8GB
- Corsair Vengeance LPX DDR4 2x16GB 3000MHz
- Windows 10 Home

 

 

Thanks for your help.

 

Regards,
Szymon.

[SupaKomputa]

Monitor the 12+ rail, should not be under / over 0.5v.

[emosun]

Does the machine do the same thing if you run it with a single stick of ram? A power supply tripping only enough to hard reset a machine but not turn itself off at all would be a strange behavior vs some other more common issue.

[szymonadamus]

46 minutes ago, SupaKomputa said:

Monitor the 12+ rail, should not be under / over 0.5v.

This is how it looks seconds before restart.

[szymonadamus]

41 minutes ago, emosun said:

Does the machine do the same thing if you run it with a single stick of ram? A power supply tripping only enough to hard reset a machine but not turn itself off at all would be a strange behavior vs some other more common issue.

Thanks for the tip but it's not it I've just did the same power stress test with one RAM stick, different slots etc. Did not change the result. It still resets itself.

[emosun]

Well it definitely could be an issue with either the power supply or the motherboard. Motherboard might just not be able to feed both components correctly causing it to crash. I find old high end boards seem to live much shorter lives than budget ones.

Power supply might be the cheapest /easiest to replace first , replacing the board might fix it provided its not the power supply.

[Morgan MLGman]

You can test the voltages on the 24-pin ATX connector on individual rails using a multimeter, if they're way off then you've surely got a PSU problem. Voltage rails as far as I recall should be 5V, 3.3V and 12V (of course they will vary a little)

[Elisis]

4 hours ago, Morgan MLGman said:

You can test the voltages on the 24-pin ATX connector on individual rails using a multimeter

Simple multimeters cannot determine whether voltages are suitable in situations like this. You need actual test equipment to do so.

[szymonadamus]

OK, so it was in fact the PSU.
I've changed my EVGA to MSI MPG, replaced all the power cables in the process too, and so far the problem disappeared. I've put the PC through the same stress tests as before and it's working properly. I've spent some time gaming and also - no resets.

So far it's looking good. Now I just need to return my EVGA PSU