Computer doesn't turn on when unplugged from the wall

[brunomeurer11]

Hello everyone!

I've had my PC for about two years now (Bought the parts and built it myself) and have been using it for gaming and my university classes as well as some basic research and programming with my GPU's.

But one thing I have noticed is that if for any reason I unplug my PC from the wall (To move it to another room, for example) it won't turn on again, even if it was turned off and the switch on the power supply was turned off as well. The power button doesn't work and shorting the pins on the motherboard doesn't work either (No sign of any fans moving or anything trying to start whatsoever). The only way that sometimes worked is by switching the power supply on and off until magically the PC turned on by itself (Without even pressing the power button or shorting the pins). The weird thing is that the power LED on the motherboard is lit so I guess the power supply is working.

I rarely move my PC and disconnect it from the wall but I am worried that this could damage my components in the long run. It has happened again this week so right now it is turned off and I'm typing this from my notebook. I have already tried switching the motherboard battery and remove my GPU's before trying to turn it on again but nothing seems to make it come alive. None of my components are overclocked.

Right now I am out of ideas so any help is appreciated. If any information is missing just ask and I'll try to answer it as best I can

Full system specs:

Motherboard - Asus H97-Pro Gamer
Processor - Intel Core I5 4690
RAM - Crucial Ballistix Sport 16GB
GPU's - Galax GTX 1080 and EVGA GTX 970
Storage - 1TB WD Blue HDD and 120GB Kingston SSD
Power Supply - Seasonic SSR-650RM (G Series, 650 Watts)

 

[sla70r]

How does it respond and behave when you shut it down, with out unplugging and moving it?

Shut down your computer, and then power it back up with out unplugging it.

 

[brunomeurer11]

How does it respond and behave when you shut it down, with out unplugging and moving it?

Shut down your computer, and then power it back up with out unplugging it.

If I do not unplug it from the wall then it works just as expected. This problem only arises when I unplug it, which I think is weird because it happens even when the PC is completely shut down and the power supply switch is turned off.

 

[brunomeurer11]

So I just managed to turn it on again by switching the power supply on and off again and again. But this time it won't turn on again (Power button or shorting pins) after shutting down, even if I do not unplug it from the wall. So basically now the only way to turn the PC on is to switch the power supply on and off until it randomly comes back to life 🙁

One thing I forgot to mention is that the PC is usually connected to a UPS, but now it is connected directly to the wall. I did use both GPU's at the same time before this happened, could that have something to do with it?

 

[Bungle11]

If your computer works as normal with it is plugged in and shutting/ powering it up via windows shutdown, i would say its is a powersupply problem at 1st glance.

You are using a 650w psu to power two graphic cards. You can power the GTX1080 with a 650w psu, but you need at least a 800w unit for two cards, especially if you are running an older 9 series nvida card. The issue will probably be that when you unplug the pc, and replug it, the psu doesn't have enough power to kickstart the entire system. Plus when it gets running, it will be at maximum load all the time. THIS IS NOT SUSTAINABLE!!. Your motherboard light will show up because its on standby and only drawing about 0.5w. IF you keep running two cards on a 650w psu your psu will eventually fail, which can cause the system to short out! End result will be fried motherboard, cpu and gpu. UPGRADE YOUR PSU NOW!!

 

[Bungle11]

http://www.coolermaster.com/power-supply-calculator/

Using the above link it recommends at lease a 700w. But if the psu 80% efficient this will only give 560w, which will mean the psu will run at effectively 100% load when you are using the pc intensively. You need a 800w powersupply to be safe.