title says it all. last night, in the middle of an essay, my laptop forcefully shutdown. i wondered why until i felt the bottom of it. it almost burnt my hand, it was incredibly hot. now ive been keeping a close eye on it and i have found out that the only cooling fan on the laptop wont spin. im not sure if it has a temperature threshold or is just broken. what would you guys suggest be the best cause of action (to both finding out for sure why its doing it, and how to fix it?)?