Proxmox stuck on "BdsDxe: starting Boot0001"

Hi,

I've installed Proxmox on my IBM X3690 x5 (old thing, I know).
The CPUs are Intel(R) Xeon(R) CPU E7- 2830, which is based on the Westmere architecture.

I am running the osx-proxmox install script, which does not report any errors, however it gets stuck on this during boot:

BdsDxe: starting Boot0001 "UEFI QEMU HARDDISK QM00001 " from PciRoot(0x0)/Pci(0x1F,0x2)/Sata(0x0,0xFFFF,0x0)

https://preview.redd.it/hlurtjixmsxc1.png?width=2245&format=png&auto=webp&s=f7d136a9b6a544f023fbe1677280c48b45a26f24

The version of macos does not matter, they all give the same error

I'm new to proxmox, so please let me know if there's anything more that could help.

I appreciate any help.