I have a ATI Radeon HD 4350 in my computer. I have been having some blue screen shutdowns. I decided to open the case and reseat the card and blow out the interior of the case just to start the process of finding out what might be wrong. All of the fans I have ever touched in a computer spin freely with no resistance at all. As I was working inside the case I reached in to the fan to spin it lightly and it does not spin like the free spinning fans I am used to seeing. It has a jerky spin to it and stops quickly. Is this normal for this device or should it spin freely like all the other fans?