I recently had to change my PC chassis and I bought a new 120mm fan for the new one as it has only one outtake fan in the rear side. Everything is going just fine but I’ve just noticed that the technician installed only 2 screws for the new fan and it seems he used the screws that came with the case. Since I got all the screws that came with the chassis so I tried installing the missing two myself and found they get stuck in the screw hole after few spins and don’t go in anymore. I am afraid that the fan probably came with its own screws and unfortunately I don’t have them. Is there anyway to solve this problem?