|If you recently installed hardware, you may just have wires running too close to a fan and now they are just touching the blades. Look into this as well as the possibility that one of your fans are going. Fans are not expensive so if is an easily replaced one, just replace it. If the video card's fan is the culprit and it is new, consider sending it back to the factory to a new one (RGA).|
You have to be a little bit crazy to keep you from going insane.