PC Not starting up

Does your new cooler connect its power cable directly to the mobo, or to a molex or something. It could be that the mobo is shutting the PC down because it cant detect a cooler on the CPU fan header and shuts down as a safety feature... Its happened to me before
 
have tried plugging in a ps2 keyboard as per advice someone at work and none of the lights light up on the keyboard so does this sound lke a proble with the motherboard?
 
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