Help problem solving PC that won't boot please

OK thanks, I am just putting the memory back then calling it a day.
I won't have time tomorrow to build out of the box so I'd best leave it until Monday. Could play with the switches if you think of anything.
 
I am OK about building outside the case, to make it easier, it would be best if I could do it on the floor beside the case with the PSU still installed. Cables are long enough.
Just checking the cooler, it's big and air cooled.
 
Both Friday and Saturday I managed to get the PC to boot up after many attempts so I left it running all day then, and when not in use I was running Furmark or Prime95 constantly just to load gpu or cpu.
Sunday I could not get it to boot, nor this morning. When it is running it is healthy, it's just getting it to the bios that is the problem.
Going to strip it down and build outside the case now.
 
No, I ran the windows memory test, which restarted the PC and reported no errors, I don't know how good that is.
I also tried two of the 4 sticks individually.
 
I also tried two of the 4 sticks individually.
Yes, we've kinda eliminated a rogue dodgy stick causing the problem by alternating sticks - but couldn't remember if we had run a test on one of the rare occasions we got in.

The skeleton setup outside of the case still seems the next logical step, unfortunately.

Ref:
EVGA GeForce GTX 980Ti Superclocked+ ACX 2.0+ 6144MB GDDR5 PCI-Express Graphics Card
Intel i7-5820K 3.30GHz (Haswell-E) Socket LGA2011-V3 Processor
Asus X99-AUSB3.1 Intel X99 (Socket 2011) DDR4 ATX Motherboard
EVGA SuperNova P2 1000W '80 Plus Platinum' Modular Power Supply
Samsung 500GB 850 EVO SSD 2.5" SATA 6Gbps 32 Layer 3D V-NAND Solid State Drive
Corsair Vengeance 16GB (4x4GB) DDR4 PC4-19200C14 2400MHz Quad Channel Kit - Black
Fractal Design Define R4 Midi Tower Case - Black
Windows 10 64 bit.
 
OK all set up outside the case. Just the mobo and cpu with power, I had to leave the graphics card in situ as I can't get at the PCI express release clip (how are you supposed to get these big cards out again?) but left the gpu power cables unplugged.
I can see the mobo LED qcodes and would expect something other than 00 to show even without the graphics card. Have tried 5 or 6 times but always 00 just like when it was in the case.
Does this sound like the fault is in the mobo?
 
I can see the mobo LED qcodes and would expect something other than 00 to show even without the graphics card. Have tried 5 or 6 times but always 00 just like when it was in the case.Does this sound like the fault is in the mobo?
Possibly, or even CPU and PSU - still not conclusive i'm afraid.

Any light remaining on?

Do you have one stick installed?
 
No memory, I thought I would get a qcode to say pre memory failed that way and it wouldn't try to go any further.
I would have thought that when running furmark the PSU was under much more load than startup, is that not the case then?
 
If I have to get a new mobo, I would go for mobo and cpu as I see ocuk don't do 2011 anymore. I will have a rethink as well as I don't play games on the PC anymore, long story but I had to give up about 18 months ago.
 
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