text: my computer fan is loud, so i smack it.? my computer is loud, so i smack it to make it quieter. my fan is 2 years old. how long should fans in computers last? i got my gaming computer from cyberpower systems, like 2 years ago tho. i can play cs:s and stuff like that. but my computer has always been loud, but now my old fan is loud, alignment in it is off i think. smacking it works for like 10 seconds. okay maybe 5... how long should fans usually last and where can i buy a good quality fan without spending 100 bux? fans last as long as they last. your fan is noisy due to dust build up on the fans spindle short term fix if it is your psu fan , use an air duster to blow into the fan clearing the dust,  if it is just a case fan then you can also spray the fan spindle with electrical contact cleaner.