as they get dirty, the start to clog up & make a general grinding noise, the solution is to a. clean the HSF with a compressed air blast & b. put a drop or to of oil into the workings of the fan (poss need to unscrew the fan from the heatsink first...
but after 2 weeks, unlikely...
Hmmm, wonder if I can get a valid page fault ???
these invalid ones are far too commonplace...