OS Upgrade Problem with Big Sur and Monterey/Ventura/Sonoma

I have a HP Prodesk 400 G2 Mini:

16GB 2133MHz Ram
500 GB sata ssd <- primary
500GB NVME ssd <- secondary/data
Core i3-6100t
intel UHD 530

I hacked and booted successfully into big sur and ran it for 5 days, but when I got the monterey installer from apple app store, and ran it, it rebooted. After reboot, whenever I try to select my ssd, it would go to a black screen. Note I am using the DP port, not VGA. After reboot, the upgrade changed the name of the recovery drive to recover 12.0. But both the drive and recovery will not boot, but go into a black screen/no signal state. Please help as there is no guide for this machine. In big sur, I had made sure everything, even gpu was working. EFI files can be uploaded on request.

submitted by /u/Pro-Computing-101
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