solved. Keeping it up for future reference.
It was the NVIDIA drivers.
Even though I reinstalled the drivers, I should have done the DDU complete uninstall (and in Safe Mode) before doing the reinstall.
The odd thing was it worked prior to Win 11 upgrade. So in doing the WIN 11 upgrade, something happened with the NVIDIA drivers.
Noob mistake.
Thanks for the suggestions everyone.
Here is the original post.
The HDMI port is (mainly) not working.
When I boot the system, the port works for making changes to the bios, so that is good.
But when it gets into windows, I just get a black screen.
I have all the software/firmware updates.
Running the last NVIDIA software for Windows 11.
I am running Windows 11.
If I boot using the motherboard HDMI port, it works fine. The other card ports work since I can use them for the VR system.
However, if I unplug from the motherboard and then try the 3080 HDMI port, same problem.
I rather not RMA the card since I suspect there is some software/configuration problem since it does work when making changes to the BIOS, and I can still use the card for the VR app (my main usage)
ASUS Maximus Hero motherboard.
Any ideas greatly appreciated!
post edited by evgadaddio - 2021/10/24 09:13:50