I'm building a new PC, I have everything except for the CPU and RAM. Do I need them for the PC to start up, like the fans starting up that are connected to the motherboard? I usually do this to check if what I currently have atleast turns on. I've tried turning it on, but nothing happened? On my old build, when I was waiting for my CPU to arrive. It turned on without the CPU, maybe cause it had RAM, and this one doesn't. My motherboard is an ASUS H170 Pro/CSM.