Maybe it's full with dust. Have you opened the case?
Thanks for the reply rezervesizeja, I wish it were that simple. New Install. No dust yet. -- So at least I am correct to be concerned? That is something.
Does it appear to spin slowly? I.E., do you see it spinning at a very slow speed? First, turn the computer off and spin the fan. If it spins well, the brushes could be bad (assuming it has them). My advice is to buy 2 new fans and run them in push pull. I did away with the Corsair ones. Try two Antec 120mm three speeds. Just leave them on the medium setting all of the time.