I was wondering about this but when I got my new computer few days before thanksgiving a week later my computer all of the sudden had the cooling fan full power for many hours even it was on the desktop and running no programs. I rebooted my computer and then the fan ran like normal. After that for a long time this never happened again but yesterday it happened again and just rebooting fixed the problem. I just hope my notebook is perfectly fine but is my system defective? This doesn't happen like once a week or so but it happened again after 4 months later. I don't know if it will happen again but I just wanted to make sure that my computer is ok.