Make sure all you VGA power connectors are fully seated.
It's possible you have a DOA card unfortunately ..... I chased this with my R9 290's and a Pair of 980 KPE's.
SS
Case Labs S8
ASUS X99 Rampage V Extreme
i7 5960X
EKWB XTX360 kit +1 XTX360 & XTX240
10x MassCool fans on a Lamptron FC5 6 Channel 30W LED Fan Controller V3
32GB Geil Potenza 3000Mhz
2x Samsung 840 EVO 1TB
WD 7,200 Hybrid 2TB
ASUS Blu-Ray RW
Gigabyte 980Ti G1 EKWB full block
Acer XB270HU monitor
EVGA 1200 P2
Razor 7.1 phones, Death Ader & Ultimate KB
Madcatz Panther XL SteveO modded