I realised that the little 2 pin plug hanging off the 6 pin plug could be used tomconvert the 6 pit to a 8 pin. So now I have power to both sockets and the card seems happier.
However no I have lost the inboard video output that I was using.
My monitor does not have a displayport input and as I cannot get a displayport-hdmi cable until Tuesday.
I now understand that at least one monitor MUST be plugged into a display-port output so I will have to wait till Thursday to use my nice new machine.