Lately my CPU fan has been roaring along at 100%, and I'm having trouble figuring out why. It will, at one moment, be running quietly, and the next moment blazing at 100%. I haven't changed anything in the BIOS settings, nor have I installed any new hardware. The heatsink itself is not dirty, its got a little dust in it, but not enough to obstruct airflow. Using temperature monitors tells me that the CPU is hovering at a constant 26-29 C. Its strange because it's never done this before, and I'm worried that running it constantly at 100% will end up breaking it.
I can control the fan via SpeedFan, but my concern is that this might be a sign of a bigger problem. Any thoughts on this?