I just bought a case and it came with a 350w power supply. if i plug the PSU in ONLY, and turn it on, should the fan spin? because i tried it and it doesnt...does it need the mobo to be attached first? thanks.
For starters, you need to short the green wire with one of the blacks to turn it 'on'. The back on/off switch is just a master switch - you still need the turn-on signal from the motherboard to start it up, or simulate it by shorting the two pins I mentioned.
Secondly, the powersupply also needs to be under a load to turn on - a hard drive will do.
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