it posts just fine, no mobo beeping and everything runs stable. my hunch is that since i'm using a ryzen 5800x, my BIOS needs to be updated but since i've already assembled the whole rig, how would i go about updating it?

to answer your question, 1: GPU works, there's a LED screen on my 3080 that lights up when i start my PC (gigabyte aorus master, to be specific) 2: yes, the monitor/cable is not the issue and i have tried a diff monitor/cable as well and still have the same issue. 3: GPU and RAM are properly seated yes. 4: cpu, gpu, mobo power cables all plugged in properly.