MSI Z170A Titanium issues... Help Please

[Fluke]

I have started my new build and am having problems, my system comprises of:

i7 -6700k
MSI Z170A Titanium
32Gb Corsair Vengence LPX DDR4 (2400hz)
Crucial 500Gb SSD
2x MSI 980Ti

All of this is going into a Thermaltake Core P5 case.

I had major issues with the system freezing and no display through the 980ti, By running a single memory stick and using the motherboards on-board video display, I managed to re-flash the bios from ver 1.0 to the latest version 1.6, and now the system can see all 4 sticks of the memory.

I am still however having no luck whatsoever getting a video signal from the 980ti's.

The vid cards were working perfectly in my previous build, and I am starting to suspect either the TT riser cables are at fault or that there is an issue with the board itself?

I need to try the vid cards without using the riser cable, which is a bit of a pain as they are both bridged and have water blocks fitted. Can anyone else suggest what else I should consider?

I would appreciate any help given.

 

[stulid]

Maybe the cpu block could be overtightend causing the socket pins to not make good contact as the boards PCB is bent.

 

[kully1972]

I would take it apart and reseat everything. Also ensure xmp is not enabled. If ure using risers then thats a further variable to eliminate.
I have the mobo myself and it is super stable.
Also try just using one card in the beginning and in bios make sure i initial disply is set to vid card.