Hi Guys, Which do you reckon i have

up?. got a new corsair power supply and all booted up fine and dandy,now since pc was now apart i thought i would put some artic silver on the cooler now i knew everything worked ok

. now pc wont boot at all, unless the atx 4pin cable is not connected, even though it boots without this cable it wont actually show any kind of display at all no beeps etc, all the fans start ,power supply fans, cpu fan case fans etc but no display which i think is normal anyway if the 4 pin atx is not connected. as soon as i connect the 4 pin atx cable no boot at all, the fans go for about 1/4 a second then nothing. so my question which do you think i have killed?, the motherboard or cpu, I know I had to press rather hard to reattach the intel heatsink so my thinking is I have damaged the mb somehow, broke a tracer or something,I suppose it had to happen sooner or later about 200+ pc builds and never damaged one yet

.anyway question is more to see if any one has actually seen this effect before .cheers Mike