Am in the process of building a new pc and have encountered this problem: I get power to the board but the fan doesn't go round, so I have to immediately disconnect to avoid damaging the processor. What does occur is that the fan moves slightly then stops when first switched on. There don't seem to be any obstructions, will check that again tonight.
Any ideas? I am using a 20 pin + 4 pin 400w psu in a new intel core duo board which has a 24 pin connector, is it possible that insufficient power is getting thru?
I have plugged in the cpu fan to the correct slot btw.