HP Pavilion G6-2320er OS/Software :: Laptop Shuts Down Due To Incorrect Operation Of Fan

How to solve the problem with a laptop. I have HP Pavilion g6-2320er (A6) and on it the operating system Windows 8. For a year this laptop works well (from date of purchase passed just over a year). Warranty expired in August 2014. (At the moment the guarantee is not performed). The problem is that the laptop began to overheat. It just shuts down. I began to raise it to ventilation air passes better.

But now it began to frequently shut down and even after the easy way out, when turned on, gives me a strange message: "The system has detected that a cooling fan is not operating correctly ... Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown possible system damage. The system will shutdown in 15 seconds. To prevent shutdown and continue operation ... "Of course, I understand the general meaning. But what is the reason for such work "fan" and what to do to more of this happening?