So- I have been foldiing as much as I can lately. Unfortunately, I have noticed on my Revision B TiBook, she is having problems running the fan on low. As you all probably know, the TiBook has a high and a low fan setting. After running folding as much as possible, I have noticed that when the fan is on low is sounds REALLY bad. Basically, it sounds like the fan is unable to move when on low. Of couse, it jumps to high after a few seconds/minutes of low speed action. When on high it sounds normal. My question is: has anyone experienced this? Is this just a problem from dust, or is my fan dieing? Can I fix it? (I took her apart once, I am not afraid to do it again.) Any ideas to help? will she overheat?... Anythng! Thanks a lot everyone! And: STILL FOLD!