Did you consider opening the notebook and hardwiring the fan to like 5V or 7V? (you get 7V as when you for + use +12V and for - you use +5 = 7V ) Or this is not possible due to warranty?
My warranty has expired... Im willing to give it a try but I don't know how to do it. Can you post instructions or a link to a thread that explains how to do so? Thx