@thomastospace For system installation it's recommended to leave only system disk connected or enabled in bios (not always possible for nvme drives).
Problems with entering BIOS are caused by OS shutdown directive. On Windows hold shift key while shutting down to remove it.
Ps. I'm in the process of migrating old system to new rig myself and oh man, the ridiculous problems I had to solve made me write my future blogpost draft, because there's no way to remember them all.