I built a new computer 3 weeks ago, and had it up and running fine. I was even using it last night to watch movies. I woke up this morning to turn it on, and got a little surprise. It will not boot up. When I hit the power button all the fans kick in the LEDs turn on, and then seconds later it turns off by itself. Nothing shows up on my monitor, in fact my monitors power LED blinks as if there is nothing connected to it. I am afraid this is a serious problem. Which piece of hardware might I have to replace?