Issue with X299 Taichi No video through GTX 1080ti

I've just completed my new build today. 

My system:

X299 taichi

i9 7900x

32gb crucial 2666 memory (2x16)

Gigabyte GTX 1080ti

500gb samsung nvme 850 evo

240gb kingston ssd sata III

3TB Seagate HD Sata III

Noctua NH-D15

Corsair RM-850X

Corsair 600Q

I get no video through the HDMI connection on my video card. I'm really nervous because I can't get to the bios (since the chipset has no integrated graphics) without the video card plugged in to test if the problem is with the graphics card or with the motherboard.

The system is brand new, I've built everything tonight and have been for hours and hours trying to get it to work with no success. The dr. debug led on the motherboard has the red light to the side turned on and is displaying the code: "E5". There is no bug information related to this on the manual and i've tried searching the web for it and found nothing.

Please help me, I'm can't know for sure if the problem is with the motherboard or the graphics card (which is brand new and should be working as well).

Thanks