When I first got my PC my CPU? Fan would occasionally get bursts of activity during gaming or heavy usage.  Not sure when but It has stopped boosting itself when stressed and my PC has started Overheating and shutting itself down during gaming.  How can I get the fan to start doing what it is supposed to do again?  I checked the bios and there weren't any options for fan speed there. Also the motherboard for the 540 doesn't come with any options that allow a program like Speedfan to adjust it for me.  Help would be appreciated.  I know I could always just buy a more powerful constant fan but I would rather not spend the money if I don't have too.  Thanks

     - Chris