Bricked computer

I have an Alienware X51 R2, I don't remember the stats right now, but it wasn't cheap. I've had it for about a year and a half, and it's dead. It had only been running for about half an hour when the video cut out. When I investigated, I found that my computer had died. It made no noise, the fan wasn't running, no signs of life. I unplugged and replugged everything and tried to restart and found that while the power light would come on, it would not boot at all. The fan would even start up very briefly, but die almost immediately. Does anyone know what the issue might be? Really broad question I know, since it could be anything from a burnt connection to a dead motherboard (good god, I hope not), but still. Anyone have any ideas?