My Alienware X51 won't start only a dim light

I was playing games earlier and suddenly my pc shut off, screen went blank mouse and keyboard lights went off and I was only left with a dim light from the power button. And every time I try and restart my system it just goes to that same dim light. I can't even hear the fans or anything trying to start up. I've tried several solutions such as unplugging everything and holding down the power button for 30 seconds, and ways to get it to work again? Because I think it's warranty has expired.