Sorry for bumping, but this is something I've just noticed over the past few nights...
It seems for 45 seconds exactly, my fan goes off at full speed, and it's NOT because my laptop is hot because the bottom doesn't feel hot at all. Then it blows at about half as fast for 90 seconds. I know this is not normal, because I've used other laptops and they behave nothing like this one. It happens regardless of the temperature, and even when I have it on a flat surface where air can circulate. This scenario happens about every 5-10 minutes. This is especially pissing me off since I use this laptop to Skype and others can hear the fan when I chat on it. Can anyone help?