Hey guys I could use some help here. Brand new water cooled build and cannot get video to post. I am getting Post code A6. Tried unplugging the card (vertical mount and plugging it in other pcie slots to no avail. I was grounded during the entire build process so I am confident components are not damaged (at least by me)
Troubleshooting by using another v card is not really an option due to hard tubing used in the build (I would have to perform a complete tear down.) I notice the board has a display port connection but there is no mention of onboard video in the manual. Not sure if I can do anything with that but plan on grabbing a cord asap. Has anyone else experienced this? Any intelligent ideas?
 
Intel Core i9-9900K Coffee Lake 8-Core, 16-Thread, 3.6 GHz (5.0 GHz Turbo) LGA 1151 (300 Series) 95W BX80684I99900K
EVGA Z390 Dark, LGA 1151, Intel Z390, SATA 6GB/s, USB 3.1, M.2, U.2, EATX, Intel Motherboard 131-CS-E399-KR
CORSAIR Vengeance RGB Pro 32GB (2 x 16GB) 288-Pin DDR4 SDRAM DDR4 3200 (PC4 25600)
GIGABYTE AORUS GeForce RTX 2080 Ti XTREME WATERFORCE WB 11G Graphics Card, Pre-Installed Waterblock, 11GB 352-Bit GDDR6
(2) Intel 660p Series M.2 2280 1TB PCIe NVMe 3.0 x4 3D2, QLC Internal Solid State Drive (SSD) SSDPEKNW010T8X1 set up in RAID 0 configuration
MSI Optix MPG27CQ 27" Full HD RGB LED Non-Glare Super Narrow Bezel 1 ms 2560 x 1440 144Hz Refresh Rate Steel Series
Phanteks Evolv X PH-ES518XTG_DGS01 Galaxy Silver ATX Mid Tower Computer Case with:
Alphacool Eispumpe VPP755 Single Edition pump

Thank you for the reply.
I only have a usb keyboard and mouse connected.
I cannot enter bios because there is no video, so I am dead in the water for now.

I am using the monitor shown in my first post. It works. I have tested it on my MSI laptop.
I am thinking of picking up a display port connection tomorrow to see if there is video coming through the mobo but again, not sure video is even on this board.
I unplugged the keyboard and mouse, got the expected errors, then still no video, stops at A6 and 5 fast beeps.

Are you using a Monitor or a TV? Monitor connected via DSPort
Does your Keyboard have a Bios Switch? No
Also the first boot can take a few minutes before the Bios pops up. Nothing
Are all your Drives NEW? New ones are in the description, though I do have an old SATA connected. Going to remove JIC. Will report back.
Did you install a Drive with an Older OS on it? Yes, the SATA has an OS on it. Was going to format after startup.
 What is the Part Number of your "CORSAIR Vengeance RGB" CWM32GX4M2C3200C16
Remove this "vertical mount" and plug the Graphics Card directly in the PCIe Slot. Teardown. Hoping to find another option first, but will do as a last resort.
 
I will try a couple of things and report back.
Do you know if I can get video using the mini display port on the mobo?

I took a chance on the memory but I don't believe that to be the problem.
EVGA has UEFI BIOS listed in the manual. I thought I was getting code a6 but a closer look reveals that when the mobo beeps it is on code D7. The manual describes the code as 
"5 Beeps: This error is stating it cannot detect a keyboard. This can also indicate a video card is not detected."
 
I assume the latter, since video doesn't work. 

I unplugged the video card vertical cable. No beeps. Seems fine, but without a miniDSPort cable I can't see BIOS to troubleshoot any more. I will pick one up tomorrow. 
I do have another Power supply to test. Will replace that first.
Like you suggest, I may have to remove the vertical mount and try it that way. I will post more when I know more. Tomorrow though.

Sick build BTW!
 

IIININIII
OMG I got it! Something really stupid!
The DS port cable was not fully plugged into the monitor. Started right up after connecting it.

Excellent. Glad you got this solved.