Okay so i don't mind my cat sitting on my computer cause he obviously likes the warmth from the fans or something...But today i came home and found a liquidated hairball dripping into my tower. Now the thing won't turn on. nothin'. I THINK the computer was off when i left for work but i dunno sometimes i put it to sleep and i come back and it's still on....so main question...what should i be looking at first?