A few weeks ago I've noticed the left fan on my Macbook Pro (late 2006) getting noisier whenever the fan speed rose above idle. I chalked it up to just dust. It has been getting steadily worse, and now makes noise even at idle (2000rpm). Just now, I've noticed it will not go beyond 4000 rpm even though the other (right) fan goes up to 6000rpm just fine. I'm wondering if it can be repaired with WD-40, or if I need to get an entire new fan? I guess it kinda sounds like a dirtbike, if I had to describe the sound. Oh, and because its a 2006 model, its obviously out of warranty and I'm not going to have them send it away for a small problem like this. I've opened it up before, so I know how to navigate my way inside of it. I'd just rather not spend $50 on a new fan when I can lube it for less than $5. Thanks everyone.