Iv no idea how to find out the make or moduel of the fan. One day last year it beggan to make strange noises, rattling. When i reset the pc it stopped. I looked online recently and found it could be multiple reasons so i opend the pc, took a good look inside, removed the fan, cleaned very single area of the fan, put it back in, ensuring nothing was damaged. When i turn the pc on, and im looking at the fan it seems to be working perfectly but with the noise. If i run my finger along the smooth centre to slow it, it makes no noise. If i slow it down with the three speed button thing that hangs from the fan then it still makes a noise. The fan has lie a suspension on it and when i press it in theres no noise, when i let it go the noise rattles again. I personally think that inside the fan, right where the motor is spinning theres is a problem of dust or something but i can't be sertain. I want my fan to make no noise but be on full speed as befour since im a heavy gamer and i work with music too. What should i do? If i want to buy a new fan, how do i choose one that will fit into it's place? My pc uses a fan for the power supply, a fan for the cpu and a fan on the side of the tower. What do i do if i want to add more fans to my pc tower?