Switched Pc case, pc won't boot anymore

My case was obsolete, so I decided to switch to a newer case.

When I assembled the PC, with the same components. The Boot light would light up, the BIOS would recongnize my m.2 SSD, and two other harddrives, but wouldn't let be boot from it.

After browsing the internet, I'd tinker with the boot options. Switch AHCI to Raid, go from UEFI to CSM, try to troubleshoot my Windows Install with a boot medium. None of it worked. When I was ready to give up, I've decided to just do a clean Windows install again (if it would let me), when it gave me a strange boot option that booted me into this.

I shut down my PC and now it won't show my any screen. Neither with integrated graphics nor with my GPU. Atöeast none of the lights are on now.

Any ideas?

Build:

B550

5060 Ti

Ryzen 7 5800x3d

32 GB of ddr4 ram

1TB Samsung 970 m.2 SSD