overhating

So, I wanted to fix the Laptop from my little Brother. He plays games on it and it randomly turned off. He stayed it was doing that like every few hours. I thought it overheated. And it was full of dust. After I cleaned it up, plugged only the board in, pressed the button and it turned on! So...

Hello. Recently my laptop's fan started to sound loud and after awhile it got slower ! So i decided to take it out and add lub so it will be good like before . But i got stuck on how to open the fan itself !? It doesn't have any screws ! Only plastic pins that hold the part together !! Check...