HHHeeeeellllppppp

wasnt producing enough power for the 8pin plug for the cpu tried friends psu and started up straight away :)

Good grief I'm amazed as I would tend to think that there could be something wrong with your corsair HX 850 if that is the case.
Glad that you have got it sorted though.
 
I would agree that it might well be warranty time. Could you not find a utility which shows how much current is coming from the auxiliary 12v supply for the motherboard from that Corsair PSU, just to check if what you are thinking is correct..?

I have the same HX850 and it has been a great PSU.
 
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