Hello! I just built a computer yesterday and today I am installing drivers and what have you. Initially I did a test boot outside of the case to make sure everything was functional. With that test boot my graphics card powered on and both fans spun. While installing drivers today I happened to open the case to see that only ONE of my fans is spinning. Is this normal or do I have a defective product? Is there a reason that yesterday both fans spun on boot and now only one is spinning?