So my brothers computer one day just wouldn't turn on at all. Tonight, he swore up and down that it was NOT his motherboard because there was a led light that was working when he tried to turn it on. I took it home with me and plugged it in and everything. It makes no noise, and does aboslutely NOTHING when I try to turn it on. But that ONE led light(on the mobo) does turn on when I hit the power button. I believe the motherboard is dead. I figure, if nothing happens(when powered) except for a light turning on that it means the computer is just getting power and the mobo is dead. Am I right? Is the motherboard dead? And is there a way to test all these parts(I'm in school for computers, just haven't learned how to test things)? Thanks guys.