New build, system posts, no video to access BIOS.

[Ethan_NLHW]

So after months of procrastination I finally finished my latest build. Ironically, this is the first one to give me problems upon first boot. I'm running an Asus Rampage VI Extreme Omega with a 7980XE. The OLED on the board goes through the entire post process without a hitch, then shows the CPU temperature as it should by default. I get absolutely no video at all from any of the DisplayPorts or the HDMI on the GPU. Never had this happen before and I'm kind of lost. I had the GPU on my test bench for months without issue (added a waterblock to it since, but that shouldn't matter), and the CPU came out of my previous system with the original Rampage VI Extreme. So I know they both are working. Any help would be appreciated.

[Ethan_NLHW]

So for anyone who sees this, I figured I'd add that I isolated the problem. After tearing down the system and trying my other 2080Ti, I replicated the issue. So no dead 2080Ti FTW3 is good news. Next, I removed the riser card and plugged the GPU directly into the slot. Still no video. Okay, so maybe the motherboard is dead. Sad day. After that conclusion, I tried the DisplayPort cable that came with my monitor, which I know works. Much to my relief, I had video. No RMA for a $800 motherboard today! So the issue was the supplied DisplayPort cable that came with the vertical mounting bracket. Cool, now since the mount came with two, I can just use the other one right? Wrong. Hooking up the other DisplayPort cable gave me video, but only for a few minutes at a time. Now you may ask, why didn't I try the different cable first? Well the way that this vertical mount is designed, it only allows for 90 degree connections to the back of the GPU due to the little metal slot dividers. So a regular cable wouldn't work which is why I had to tear down half of my system to get to it. So now I need to figure out if they can send me new ones, or butcher my case to be able to use standard straight connector cables. I love hardline watercooling, but man does it suck when you have to tear something down lol. Lesson learned. Hope this helps someone.