I'm using a Toshiba Portege m200-s838 laptop, and recently decided to venture under the motherboard to see if I could find anything obvious causes for an unrelated problem. Unfortunately, upon reassembling the machine I have somehow caused a new problem to come up. When the computer gets too hot now, the fan will begin spinning (faster and louder than I recall it ever doing before) for about 2 seconds and then stop. It'll wait a moment, start again, stop again, and continue to do this a handful of times before the system decides to tell me to shut the computer off immediately. I've tried unplugging and plugging the fan back in and am not quite sure what else to do to make it behave. What could cause this sort of behavior in a fan? Will I have to spring for a new one?