Alright, I'm posting this for a friend who's pc is dead and needs some help. He's got an older HP with windows XP probably around 99 or so? His monitor works fine but when he tries to start up the pc nothing happens. In the back youll see the green light on the power supply light up then just go out and nothing at all appears on screen. It finishes it's little "shananigans" in a couple of seconds and the only way you can tell the computer is even trying to start is that you hear the little "crackling" noise you get when you start your computer up and the speakers are on. I assumed it was a power supply problem but im not completely sure. Some help please!!!