The build is together but having issues with display. See build specs above.
I've quadruple checked that all of the PCIe cables are plugged in tight and correctly, the GPU is firmly in the slot, and the HDMI cable is plugged into the GPU.
I don't think it's the PSU as a friend loaned me his 1000W PSU to try and got the same issue. Plus, it's doing this with little to no load on the GPU.
About half the time, when I power on the PC, there's no signal to the monitor. No display at all. If I power it on and off a few times, I will eventually see a display, can get in UEFI / Bios, and boot Windows 10. From there, it will randomly crash to black screen and no signal. It's done it just sitting at the Windows home screen so no real load on the GPU. When I go to install the GPU driver, it wants to crash to black screen, except one time I got it to fully install... and still crashed.
Previous GPU is a GTX 980. I ran DDU (in safe mode) to start with a clean slate with the new GPU before installing it. I swapped the 980 back in and it works fine. I tried DDU again and same issue.
The one time it stayed up long enough to install the driver, it showed up in device manager but with a warning stating something along the lines of being disabled due to the device not working properly. Before I could dig into that, it crashed, and haven't been able to get that far again.
All other drivers are up to date. The BIOS is updated to latest version. I'm not really sure where to go from here. If it's the GPU itself and I have to RMA it, so be it, but I want to exhaust all other options before resorting to that. I'd hate to exchange it for another one only to still have the same issue.