I was using my computer the other day and all of a sudden, my mouse stops working. I must investigate. I notice that the USB tree i have connecting many of my components including my keyboard and mouse is unplugged. I surmise that this dilemma can be remedied simply by plugging it in, but alas, the moment i plug it in my computer powers down, never to be heard from again. Did i blow out some circuitry in my motherboard, or have i compromised my psu? What should i do? Do i have to replace my computer or at least some key components?