I have been building systems for a little over a year, and I am at a strange point that I can not get past on this x79 Dark/3930k build.  
 
When I plug everything in, set up outside of the box for testing with a watercooling loop specifically designated for the CPU itself, I can get a click as the PSU tries to provide power, but nothing more.  
 
Twice I have received post codes.. FF, which I located the post code issue here: Click me : and I have tried everything I can think of.  The PSU is the Seasoninc 1050w from Little Bother, and all wiring and one 760 are also borrowed from Little for testing purposes only. Everything will come from Big when the time comes, but it is too much to break down the entire water loop just to test. 
 
Using the XPG Ram in Slots 1 and 3 as well.  Water flow is good and cold, as there is nothing else in the loop and there is a 240mm radiator holding everything together.  All cables are seated Flush and Tight, and I have even included the secondary 8 pin CPU thinking maybe that could have been the issue.  
 
I have cleared CMOS, removed the CMOS battery, tried all of the BIOS selector switch options, and have not yielded any results at this time.  
 
The only next step I can take, is to pull the PSU out of BIG and see if maybe the wiring is slightly different between the Enermax PSU and the Seasonic, but that will take a little longer, as I would have to go through finding a few of the wires from the secondary PSU that I have as a backup.. 
 
Before I do that, does anyone else have any other ideas or better options, so that I can avoid jumping through some fairly unnecessary hoops to get this systems running? 
 
P.S. for anyone that has followed anything I have been saying, my 780Ti's were "gone" for a little while.. they went to Aus, where all three were tested with the 3930k that I have installed, showing that the CPU is fine.. the only thing that has not been tested, was the x79 Dark, prior to my purchase of it, so I am hoping that I don't have to RMA as it would have to go through too many hands to get back to me, since Military addresses (APO) is something that EVGA doesn't ship to.
 
 
*EDIT* Just hit Clear CMOS and now I am getting Post Code C.  Going to try to pull the PSU out of Big, and see if that may be causing the problem, as advised here: Click me : and will repost back later.
 

Just did the PSU Swap, and nothing more than already reported happens.  I have tried 3 PSUs, 2 CPUS, all wiring I have and nothing changes.   The board is on the CardBoard box that it came in, so a grounding issue is not the problem. :-|  Getting a little frustrated, as I wanted to have this completed prior to going on leave.

Yes.  There are no visibly bent or missing pins either.  Emailed the individual that I purchased the board from and waiting for response.  Time will tell, and if nothing else, I will send it back to EVGA for a RMA.  I have one more 4820k that I could test it with, but I would have to break down a buddies computer completely, and walk 5 miles (no cars in Korea) round trip just to try it, when I have already tested it with Proven CPUs and PSUs as well as a Proven Graphics card.
 

check all power connections at the PSU and MB
 
I had this happen a few days ago when I reconfigured the water loop on my rig. I didn't have the 24pin connected all the way in on the PSU got the FF and brief power and shutdown. check my cables and found that. Fired right up after.

EVGA is suggesting I try everything I have already mentioned, so I am going to attempt to RMA this board. Let's see what happens with the APO address issue :-/

Scarlet-Tech
Prior to RMA, I decided to attempt one more motherboard, Asrock, and make sure the 3930k wasn't the problem. 3 PSUs, 3 motherboard, 3 GPUs, 3 ram set, and the only thing not working is the x79 Dark. Definitely time to send this board back, and incur the headache of being in the military, and having to pay super shipping rates around the world. Yay....

That's a bummer.  Sure sounds like the board is the issue after all your troubleshooting...

Well, GL bud.  Hope all goes smooth.  Or as smooth as possible in your situation...

Scarlet-Tech
I have been building systems for a little over a year, and I am at a strange point that I can not get past on this x79 Dark/3930k build.  
 
When I plug everything in, set up outside of the box for testing with a watercooling loop specifically designated for the CPU itself, I can get a click as the PSU tries to provide power, but nothing more.  
 
Twice I have received post codes.. FF, which I located the post code issue here: Click me : and I have tried everything I can think of.  The PSU is the Seasoninc 1050w from Little Bother, and all wiring and one 760 are also borrowed from Little for testing purposes only. Everything will come from Big when the time comes, but it is too much to break down the entire water loop just to test. 
 
Using the XPG Ram in Slots 1 and 3 as well.  Water flow is good and cold, as there is nothing else in the loop and there is a 240mm radiator holding everything together.  All cables are seated Flush and Tight, and I have even included the secondary 8 pin CPU thinking maybe that could have been the issue.  
 
I have cleared CMOS, removed the CMOS battery, tried all of the BIOS selector switch options, and have not yielded any results at this time.  
 
The only next step I can take, is to pull the PSU out of BIG and see if maybe the wiring is slightly different between the Enermax PSU and the Seasonic, but that will take a little longer, as I would have to go through finding a few of the wires from the secondary PSU that I have as a backup.. 
 
Before I do that, does anyone else have any other ideas or better options, so that I can avoid jumping through some fairly unnecessary hoops to get this systems running? 
 
P.S. for anyone that has followed anything I have been saying, my 780Ti's were "gone" for a little while.. they went to Aus, where all three were tested with the 3930k that I have installed, showing that the CPU is fine.. the only thing that has not been tested, was the x79 Dark, prior to my purchase of it, so I am hoping that I don't have to RMA as it would have to go through too many hands to get back to me, since Military addresses (APO) is something that EVGA doesn't ship to.
 
 
*EDIT* Just hit Clear CMOS and now I am getting Post Code C.  Going to try to pull the PSU out of Big, and see if that may be causing the problem, as advised here: Click me : and will repost back later.
 

So you reused the wiring from the enermax to the seasonic? That's not a good idea cause a lot of times different manufacturers will have different pin outs on there wires. Never reuse wires like that...really its not even a good idea even if its the same company because of different oem companys they will use in different lines or even between the refreshes of the same lines.

yeah I didn't think you would do that because you seem pretty knowledgeable from your older posts, but you never know.... people do strange things sometimes in frustration so I had to ask. I didn't look up the psu's individually, was just going by your post. It was pretty much all I could think of by reading what you wrote, and def was not meant to insult you at all. :)

These days evga offers non bluetooth verison for dark , so before they ship it back with a working one ask them whether it has bluetooth ( only if you have any use , but I prefer it to be there) . 
EVGA Taiwan are really good people. You can get your problems sorted out soon.
GL
 
 
 

Received the RMA at my Fiancé's house just a few minutes ago. I have nothing to test it in, so I will be shipping it to myself and grab it there and rebuild as soon as the weekend hits.

Note: I had received the EVGA TORQ mouse pad from the offer, and was waiting to do ship it back.. It fits PERFECTLY inside the motherboard box. I label that another win :-) shipping that guy to myself for free.

Now I am fully frustrated.  Got the RMA board in, and hook everything up, which comes from a working system, and this one is doing the EXACT same thing.  I have to figure out what is causing this.  It is acting exactly how EVGA boards act when you reset them prior to Boot with the Clear CMOS button.  The power LED does not light up, and once you push the button, it clicks Once and then does nothing.  All of the LEDs on the board Flash when the click happens, and nothing else.  Not sure what to do at this point.  3 PSUs have been tried.  I tried connecting Both CPU 8 Pins. I have tried one stick of ram at a time.  What else is there that I am missing.  I checked the CMOS jumpers, and they are in the correct position. 
 
System Specs, and every thing has been tested in Multiple systems and verified working.
 
x79 Dark - Won't get a Green Power light or post.
3930k - Confirmed Working.
16 GB Adata XPG 1600
Seasonic 1050w - Standard packed cables, no modifications or sleeving.
Dual SSD's Confirmed working.
Zotac 750Ti (doesn't require 6 pin, reducing cables) 
 
 Just found a post saying that Seasonic Powersupplies won't work with this motherboard.  I am going to, Once again, try the enermax power supplies to see if Either of them will allow the board to start up.  This is frustrating, as it takes a while to get the motherboard apart, but I am hoping that this will correct the issue.  Crossing my fingers that this Motherboard agrees with the other PSUs unlike the motherboard prior to RMA.

Good news, I tore big brother completely down, removed all z87 parts, put the Dark board in (unable to use all 32 gb of Ram, so I need a better case, whoops) and was able to get the mother board to start. I only had it on for a second before shutting the power off, but it is definitely working with this power supply, so I am very grateful that the latest issue was just the seasonic power supply, and not something else. Now that I know it will power on, I will fill the water loop and start running all 3 classies on it until I can get all of the x99 parts.

Thank you everyone for the help.

Scarlet-Tech
Good news, I tore big brother completely down, removed all z87 parts, put the Dark board in (unable to use all 32 gb of Ram, so I need a better case, whoops) and was able to get the mother board to start. I only had it on for a second before shutting the power off, but it is definitely working with this power supply, so I am very grateful that the latest issue was just the seasonic power supply, and not something else. Now that I know it will power on, I will fill the water loop and start running all 3 classies on it until I can get all of the x99 parts.

Thank you everyone for the help.

That is great news bud...  Good to hear you got it figured out.

I'm glad this has been resolved for you