My case fan is really loud. Used to be that my CPU and northbridge fans were very loud too, but i've replaced the CPU and mobo, so now the case fan is the only remaining source of annoyance, and i have no idea how to lubricate it! it's a Protechnic Magic fan which came with the case, and underneath the sticker are four small holes: through two, I can see a PCB, and through the other two, just plastic. any ideas? thanks in advance!