*sigh* Nobody challenged you on what you thought the problem was. You had no reason to claim that you "Work on computers" as if to try and say your opinion of what the problem is has greater bearing on the situation at hand.
Typically people who don't know what they are talking about wouldn't even try to address this problem.
Your suggestion that his fan is reaching 100% and producing noise due to coil whine is most likely wrong, seeing as how coil whine is often attributed to higher voltages and rattling within the coil itself. You have just jumped right over the possible solution that the fan is simply generating more audible noise due to higher rotations, and decided to suggest a far more serious ( and uncontrollable)problem without any good reason to point towards that.
http://en.wikipedia.org/wiki/Coil_noise
Typically coil noise or whine is attributed to shotty craftsmanship.