I fixed the issue by switch to alternate bios on graphics card. I can see the display during post and bios. I ran the GPU-Z utility to find if the UEFI enable or not. It was disabled. I turn the switch  to second position on GPU and now it shows UEFI enabled. Both bios versions are same. I would like to thank you everyone for your suggestion.
I am troubleshooting my friend's Aurora R11 to disable overclocking. The Aurora R11 is running with a non-OEM Radeon RX 580 instead of the OEM RTX 3080 video card which came with the system. The monitor only shows after Windows loads. But, if I press F2 to enter BIOS mode, nothing displays. But I can tell that the Aurora R11 is in BIOS mode because when I press the power button, it switches off without going through shutdown process. I even tried an Nvidia 1700 card which only has DVI ports but still can't see display in BIOS. How can I fix display issue during post or BIOS mode?
Aurora R11, no display during post/BIOS