I have a question regarding those fan control iMacs. A little backstory: my 2011 iMac has shut down twice due to overheating (from playing Starcraft II and from watching youTube videos via HTML5), so I'm now wondering about solutions. I read a bit about fan control, but I don't understand something: if the iMac can have increased fan speed, why doesn't Apple run them higher than the default settings? If an app can make the fans run faster, why doesn't Apple just build it so the fans run faster by themselves to prevent overheating? Or is it that these fan control programs are not good for the iMac? Is there any reason not to set your fan speeds to higher than what Apple has set them to? Do they make the fans' lifespan shorter, damage them, etc? If anyone can shed some light on this, appreciate it.