Mr2Much
Jonathan,
 
Have had the new unit installed for a few weeks now.  You should have received the return.
I am starting to have problems again.
Most mornings, after it has been turned off overnight, I cannot get the computer to power on.  If I unplug from power source and wait several hours it starts and runs fine.
 
I cannot believe there is a problem with a third unit.  To a non expert like me, sounds like some kind of thermal overload issue.  My question is what could be causing it?  I have tried the unit plugged into the wall directly and through a surge protector.  Same results.  If I leave running overnight, it is shutdown by AM and same problem.  I have rarely had an issue where it shuts down while I am actually using.  I am going to try unplugging overnight and see if that makes a difference, but to be honest, not how I feel I should have to do it.
 
Any ideas on something I might be doing on this end to cause it, or something else to check, would be greatly appreciated.  You guys have been great, but I just do not want to keep doing the same thing hoping for a different result.
 
Thanks.

geriaktricks
I have been having this exact same issue with my 850 gs, made a post about it awhile ago here on the forums and didn't get a response from them. I have been through 5 units now over the course of about 6 months, all of them work fine for a few days and then start having issues with powering on. Have contacted support numerous times and they just give me the same response "sorry you have been having issues with this unit, we would like to offer you an advanced RMA", pretty much all of the negative reviews on newegg are complaining about the same exact issue. EVGA won't give me a refund and told me all the units I sent back passed internal testing. I have done the paperclip test on each unit before sending back to verify it was the unit itself and nothing to do with my pc. Each time the unit will power up once, but won't power on again once it is switched off.
 
If anyone from EVGA is reading this, I don't give a damn about your warranty terms, I have tried your RMA process several times, you sold me a defective product and I want a full refund. I have bought several evga products over the years and recommended them to friends, but this issue has pretty much turned me off from buying any more of your products. To OP, I really hope you have better luck than I have, this has been the most frustrating issue I have come across in about 6 years of building pc's. The first unit I had actually worked for about 6 months before I had to return it for a different issue, so my best guess is they just have a defective batch of units going around right now. If anyone from evga wants more information about the issue to try and reproduce it, I would be happy to give more details if it helps this issue get fixed and gets me a unit that actually works properly.

geriaktricks
Yeah, I was pretty irritated this morning when I woke up and couldn't power on my pc. I actually called support shortly after posting here, and they offered to replace it with an 850w g2 unit. I have been looking online and can't find any complaints about this particular issue with the g2 series, which I guess is supposed to be a bit higher quality and is made by a different company, so hopefully this resolves the issue.

marglas
I have issue with the supernova 850 GS as well but mine would not power the cpu only the main board. I RMA that one and just got the replacement and same exact problem. I thought maybe it is just not liking the ASUS 970 PRO GAMING/AURA so I put it into another working computer and same problem. I purchased another set of cables from newegg to see if that was the problem and no dice. This is by far the worst PSU I have run across in 20yrs. I been building and repair computers from 1995 and have been very pleased and or lucky with EVGA products. There customer service is  by far one of the best. There video cards are imo some of the best, I know as I have three running in my home and a fourth in a family members home and they all are happy. That said let me say this about the supernova 850 GS, it is from the reviews I have now read and my personal experience a total piece of junk. You have been warned do not buy this thing. To date my total lost is as follows ...power supply 118.00, RMA 18.00 shipping cost, new cables 89.00 total=225.00 and still not working.   Here is my build:
  ASUS 970 PRO GAMING/AURA
AMD FX-850
16 gig ram
2T WD hard drive
240gig ssd
geforce 1070
hyper 212
If anyone has had this problem or may know a solution or trouble shooting action that might help me fix this please let me know. One other thing is that EVO button on mine is confusing as the off and on marking are different then those on the unit right next to the switch. Seems the switch was installed upside down and makes me wonder if some of the pinouts were installed the same way.

Mr2Much
Just a quick update:
I have now been running the G2 since July.  Not a single problem with it.
Thanks to EVGA support for helping resolve this.