I had this problem too. I went to Best Buy and they blew in it with a can of air and I watched as this freaking huge dust storm came out of my computer.
You can get fans that attach to your laptop
Clean out your vents.
tried to, by blowing air into them with my mouth :\
i'm not going to fry's
Then your computer will
Ok, is it flat on something? Like a desk or a lap?
desk
Prop it up at like a fifty degree angle.