Guys what are you all on about you dont need a dgpu to get into bios, K series cpus has a igpu????
anyways for what you want to do is probably get troubleshoot your other components as your cpu is compatible from the first bios (meaning you can rule out bios compatibility), try removing sticks of ram and checking power supply connections and work from there. Reply to me if you still need help, Ill be free for a bit.