Cpu fan

okkay- so i just built a pc and it is cool and amazing and everyting, but, the CPU fan isn't spinning and its freaking me out. (by the way this is my first build) please help :/

if you're using a stock intel CPU fan make sure the wires havn't been pulled into the cpu fan (they shouldn't be super tight), ive had a few stock intel coolers do this recently, also check make sure you have everything plugged in