Recently the fan on my latitude 2110 has started staying on for no apparent reason. It used to come on if I had a web browser open (firefox) and was on a 'heavy' website like Youtube. The fan would stop again shortly after closing the web browser. Nothing on my system has changed and today I re-installed my o/s which is Lubuntu 15.04 to try and cure the problem. The ambient temperature in my room hasn't changed significantly, indeed it's probably colder.
System diagnostics show barely any cpu usage.
My machine was virtually silent and now this constant fan noise is really irritating.