I recently bought a Cooler Master JetFlo fan for my PC and I installed it into the top fan spot at the front of my Cooler Master n600 case. The only problem is that it appears that it is stiff when the fan moves, which I think may be caused by rubbing on the case, is there a way to fix this? or something else wrong? I did spin the fan before I put it in to check it worked and it was fine but as soon as I powered my PC and loud scraping noise was heard before shutting it down and unplugging the fan. Thanks in advance, Jaicob.