Put together a PC recently, running great but something is bothering me. I feel a small tapping from somewhere inside the PC when I put my foot against the side of the case. I opened to make sure none of my fans were clipping anything, they were not. Is this normal? I cant hear it, only feel it when I make contact with the case. Also, its not constant, and seems to come in spurts, regardless of what fan speed I set (using the Rosewill Thor v2). Any ideas?