Dear EVGA Forum community,
I'm wakka992, it's my first time writing on the Forum, and I'm doing it for posting a problem I'm having with my computer powered by EVGA Supernova G2 850W PSU.
A few moments ago I've e-mailed the same question to EVGA's customer service, but I'll also post it here in case someone had the same problem and have fixed it!
 
For reference, the other parts of the PC are:
CPU: Intel i7 4790k 
MOBO: MSI Z87 MPower Max
PSU: EVGA Supernova 850W G2
RAM: 16gb Patriot DDR3
GPU: GTX 970
SSD: Samsung 850 PRO
OS: Windows 8.1 pro
All the component and the OS where keeped updated.
 
The problem is that since yesterday the computer won't complete the booting sequences, shutting down after about half a second after pressing the power button (both the power button avayable on my PC: the one on the MOBO and the one on the case).
- Changing wall socket doesn't fix the problem; 
- changing PSU cable wall socket doesn't fix it either;
- powering on the PC result in shutdown in half a second, with just the led of the PC powering and the fan starting to spin. After the shutdown I have to unplug the PC from the wall for about a minute before trying to repete the operation, otherwise it won't show any "sign of life".
Strange is that when the problem occurred the first time, I just unplugged the PSU from the wall energy, retried later and it worked. Than the second time it occurred unplugging the PSU from the wall wasn't as effective, but changing the PSU from POWER to ECO mode through the selector on the front of the PSU did the trick againg and the PC booted correctly.
This morning instead, none of the listed "trick" mentioned is working for booting the PC.
I assume that the problem is the PSU and not the matherboard because the fist two times the problem occurred, I was able to "fix" it and the PC continued working without any problem as long as i used it.
 
I'm asking for your thoughts on the matters.
Thank you in advance guys!!

@ wakka992,
Welcome to the Forum.
 
Are you using any type of UPS or Power Line Conditioner?
Have you tested the Power Outlet is installed the correct way, that is the Polarity Correct?
Have you had any lighting Storms in the last few weeks that may have hit your power lines that then would hit your computer?
Have you reviewed your computer installation and check all the cables for any dust or other items that my be causing a short?
Re-Seat all your Cables on the Motherboard Side and the Power Supply Side, you may have a Lose Connection.
 
@bunkafas Welcome to the Forum as well.
Think Positive, Provide Positive Feed Back, and Do Not Dump Your Problems or Failures On Others.
Negative Feed Back Only Provides Food For The Trolling Community.

@ wakka992, your post is fine. Glad you have it worked out now.

Simply replying to a chap who had the same problem as me as I am going through a similar experience and do not know what is going on, no negativity only on my optimism of a refund.
Novatech saying 'the unit seems to be completely fine' does not install the greatest of hopes in me. Not said a bad word to or about EVGA, the fact I purchased a second PSU of same brand even though my 'almost' brand new current one died on me says what I do think about EVGA, no ?
 
Currently awaiting an RMA or email response from EVGA.. I do know the PSU is defective, was mainly curious as to what are the likelihood of a refund from them if they find it defective ?
 

bunkafas
Currently awaiting an RMA or email response from EVGA.. I do know the PSU is defective, was mainly curious as to what are the likelihood of a refund from them if they find it defective ?

 
They will send you working PSU, no problems.
You have 750 B1 or 750 B2... EVGA 750 B2 is good PSU for Bronze standard.

wakka992
@
no need to be harsh, I'm thinking positive, I'm providing Feed Back, and I'm not dumping problems on anyone.
 FACT is my computer is dead, I managed to get a reply from EVGA customer service and we found that the PSU is a defective unit.

So, I'm not "dumping problems", I'm telling that my unit is at fault.

 
Same issue here with the EVGA SuperNOVA 750 B2 80+ BRONZE. I actually received 2 defective units from Amazon. The first one powered up fine, but after 15 minutes of running Microsoft Flight Simulator X, it shut down. My GTX 280 graphics card never worked after that. The second unit Amazon sent me "works", but only until the system tries to draw enough power to play a game. The Antec 500W power supply I was using and have gone back to never had an issue. I had just wanted to upgrade because I figured I was pushing the limit of that PSU with the GTX 280. I guess that problem is solved because now I'm stuck with integrated graphics! Amazon told me to bug off and EVGA never responded. Thanks EVGA and Amazon. You sure know how to treat your customers.