Alienware X51 R2 Won't power on

Hi, here is the situation:

I was playing a game on my alienware computer when I accidentally bumped the power button with my knee. It tried shutting down but I hit cancel when it was trying to shut down Steam. I got back in to my game and continued without issue for about 10 minutes. 

Then my computer just turned off. It is not making any sounds. When I unplug it, and plug it back in, there is just a brief flash of white light. I tried draining the voltage, I tried removing the RAM and placing it back in. I've tried different cables and plugs. 

My desktop is no longer under warranty. Am I screwed?