is this a CLEAN install of Windows?
Installing Windows 11 | r/TechSupport Wiki
IF not, did you run DDU to remove all past GPU drivers (AMD and/or Nvidia) ... shutdown .. and THEN install your new GPU?
Is your motherboards BIOS up to date?
Are your chipset drivers up to date from Intel.com?
You didn't list your power supply make/model and whether or not you were running separate power cables from your PSU to each power input on your GPU
https://www.youtube.com/watch?v=UL7KIVI_hJg
IF this is not a clean install of Windows .. open up a command prompt as admin and type:
sfc /scannow
It will look for and attempt to repair any errors in Windows
You can check your systems Event Viewer for logged errors too that might help in pinpointing/troubleshooting your issue(s)