I'm getting ready to build a computer. Right now I'm buying the various parts. I have everything except the motherboard and the Operating System. If I buy the mother board and not an operating system, is there some way for me to check the mother board to make sure it's functioning. If I order a mother board and it's "dead on arrival" (DOA) I have only 30 days to return it for a replacement. My question: Do I have to have an operating system (like windows xp) to install on my new computer before I can tell whether or not the motherboard is working? Seems Xenia is saying I don't need an operating system to check my components including the mother board. Is this correct? pt.....I don't understand what you mean "complete the circuit".....what circuit and where? Why would I need to "complete the circuit"? Help me out here. Explain a bit more....I mean lots more.