PC restarts randomly. Could motherboard or PSU be faulty!

Danh_Nguyen · Dec 4, 2015

Please help me to troubleshoot my PC with following information:

- Problem: restart randomly. My PC run okay for 2 years now, but 2 months ago, it started to have problem. It restarts unexpectedly, sometime It could run for some hours than start to restart, sometime just several minutes working before restarting.

- I already tried some ways to solve this but not succeed:
+ Try to cool down the computer, now it has ideal temperature for both CPU and GPU.
+ Update the bios, reinstall new OS, update drivers.
+ Unplug the power and reset button (in case they are shorted, malfunction)

- Now I think the problem should be PSU, after 2 years using, it could start to weaken. So following some online instructions I managed to get the motherboard voltages from HWMonitor as below:
CPU VCORE" 0.756V
+3.3V: 1.824V
+5V: 3.064V
-12V: -7.2V
-5V: -6.144V
+5V VCCH: 2.843V
VBAT: 1.548V

Now I don't think these voltages are good. So do the PSU get problem, or problem is from motherboard?

Please help me to troubleshoot this problem. Thank you so much.

cin19 · Dec 4, 2015

What is your PSU model? Also check the voltage in the BIOS section too, because sometime the reading is not correct from the hwmonitor. If the voltage reading are same in the BIOS, and it is time to buy the new PSU.
Check out the PSU tier list. http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html

Danh_Nguyen · Dec 4, 2015

The PSU is FSP AS-500. I update with Voltages from BIOS:

+3.3V: 3.264V
+5V: 4.650V
+12V: 10.872V

Please help me, with these voltages and my PC symptoms, could I consider the Motherboard or PSU faulty!

cin19 · Dec 4, 2015

What GPU do you use? And the cpu/MB?
Yes, those numbers are not good, the PSU voltage tolerances http://pcsupport.about.com/od/insidethepc/a/power-supply-voltage-tolerance.htm If the PC does not have overheat problem, most likely it is the PSU. You may try use the onboard iGPU if your PC has, and if the PC acts the same, before get the new PSU you may try other PSU too.

cin19 · Dec 4, 2015

May check the warranty services because you bought it only for 2yrs.

Danh_Nguyen · Dec 4, 2015

Thanks cin19,

The GPU is AMD Radeon HD 7700 Series, CPU Xeon E3 1220, MB Gigabyte Z87M-D3H.

I'm sure about PC temperature since I tried to cool down it already, the GPU temperature is always below 50C. Sorry my CPU could not support onboard GPU so I guess I will contact PSU warranty services right now. Hope they will not make me any trouble when they ask what your psu problem then I just show them the BIOS voltages

cin19 · Dec 4, 2015

It is from the PSU, you should get the replacement. Good luck.

curiousdude · Dec 4, 2015

I've had the same issue before. I paid a few hundred to have someone rebuild my cpu because time was a big factor for me. Then only to find out later from self diagnostic that it was due to the cheap graphics card I had... Lesson learned.

Danh_Nguyen · Dec 5, 2015

UPDATED: My new PSU has just arrived, the FSP warranty service is quite amazing, they give me a brand new AS-500.
I connect this new PSU to my PC and after checking, all voltages are good. I suppose my PC will working fine for now.

After 2 weeks trying to troubleshoot this random restating, I have more experience about computer, it's sometime frustrated but pretty interesting too.
Thank you cin19 and tomshardware. Problem is solved.

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