Power failure damaged PSU?

mrdj26

Reputable
Aug 15, 2014
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4,530
Hey guys,

I hope everyone's doing well.

PC specs:

Z97 Gigabyte g1 gaming
I7 4970k
MSI 980 Ti gaming
**Cooler Master 1200w platinum**
250SSD, 1TB HDD

The problem:

The electricity in my house has been going crazy for the last month, it would shut down any min. It usually happens once or twice a day and sometimes it won't.

Anyway, last week I got an MSI 980ti, every thing was running fine so I was looking to improve it's temperature by changing the thermal paste and I did. After that I started the STRESS test from MSI afterburn and while the stress test was going the electricity failed and the PC went off.

After that the PC started rebooting alone for no reason, it may reboot after a min or 3 hours just random no matter whats the load. I thought there was something wrong with the GPU I'm not sure yet. I tried removing the GPU I really don't remember if it rebooted or not but as I said its just random. Sometimes just moving the case a bit will cause the PC to reboot which is really weird and doesn't happen all the time. I disassembled most of the PC parts and returned it back in the case just to make use every thing is tight.


I formatted the PC and installed new windows with new drivers, it only rebooted twice after that and it was running fine for two days without any reboots. So today the electricity failed in the morning, when I came back from work the pc was off (because of the power failure) but when I tried to turn it on it wouldn't. I tried every thing, changed the wires, socket, and tried the wall socket but it didn't work at all. I assumed that the power supply was dead but after 5 min I came back I saw the MB lights on :| and it turned on..now its working fine but I really need to know whats causing these problems.

I also noticed something today, when I put the PC to sleep it will wake up alone after 15 min maybe with me touching anything which shouldn't happen, can this relate to the power supply??
One more thing, there is a random coil whine which i think its new.

So guys, do you think my PSU is damaged from the electricity frequent failure? or there is something wrong with the GPU?

PS electricity here runs 99.9% of the time it just this month and i'm considering buying a UPS.

Thank you and sorry for the long post.





 
Solution
There's a MOV (Metal Oxide Varistor) on the PSU's circuit board that is a sacrificial component used to absorb voltage spikes (i.e.extremely short duration) from the AC power line (i.e. spikes caused by lightning strikes). That component doesn't last forever. It also doesn't protect the PSU from utility power grid sustained over-voltage or fluctuations.

Coil whine is not that rare of an occurrence with high end Seasonic platform PSUs.
There's a MOV (Metal Oxide Varistor) on the PSU's circuit board that is a sacrificial component used to absorb voltage spikes (i.e.extremely short duration) from the AC power line (i.e. spikes caused by lightning strikes). That component doesn't last forever. It also doesn't protect the PSU from utility power grid sustained over-voltage or fluctuations.

Coil whine is not that rare of an occurrence with high end Seasonic platform PSUs.
 
Solution