I was given 4 servers from my company recently. All dell poweredge servers. I am trying to set up my r620...

Firstly I did not want to use RAID at all so I flashed the RAID controller. I flashed it using this guide: https://fohdeesha.com/docs/perc.html and it went fine.

Something I noticed though is that, raid has to be enabled in the BIOS still, even tho we flashed the controller to allow IT mode. If I disable RAID from the BIOS, my live installer doesn't see any of my HDD's. So I left it enabled, but I don't have any RAID configs setup (cleared them from the menu from pressing ctrl+R during boot)

So I try to install my OS (booting from usb) and i remove all the drives from the bays except one.

The OS seems to install perfectly fine. I get zero issues. The imagine below is what happens when I try to boot after installing the OS. I have tried VOID Linux and Debian. Both do the same thing. I am booting in UEFI mode. Please help, any support is appreciated.

I tried 3 different hard drives....

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https://preview.redd.it/x0eck6ll910c1.jpg?width=3024&format=pjpg&auto=webp&s=1c66d0088b942b14408269445a1d5bdb0d108641