I have a dell poweredge1750 and when i boot the installer and select install the screen goes black and wont change.
I am not sure this will work. I am facing a similar issue on a Dell Optiplex 7040, the kernel just won't boot. I installed Debian Bullseye, the moment I reboot after the Proxmox install, the PVE kernel refused to boot, the original Debian kernel still works.as a workaround you can install Proxmox VE on the Debian Buster [0]
[0] https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_Buster