When I first received my x200 tablet, it emitted the infamous "fan error" code and shut off. A quick blowing of the fan vent solved this annoying issue, but the fan continued to emit a subtle purring sound, which almost became popping sounds when the fan really revved up. I could also hear the fan rubbing against something when it 'grinded' to a halt (had to listen very carefully). So instead of sending the new latop back to Lenovo's questionable service department, I decided to do some surgery of my own.... The process was pretty easy (just undid 4 screws on the back to remove the keyboard). Upon a quick investigation, I realized that Lenovo installed the fan mount too low and that the blades were rubbing against the bottom part of the computer. Stuffing some folded up slips of paper under the fan mount pushed the fan up enough so that the blades cleared the bottom of the laptop and now the fan is silent! Just wanted to post this up because I read that a lot of people are getting annoyed at how load their Thinkpads are.... This might be a common case among Lenovo owners albeit less drastic..... But now I can't even hear my fan!