No problem, mystic, next time just read my mind

Well on the face of it the power supply should be powerfull enough to run your rig and at least it's a good quality one. Just to go through the obvious have you made sure that you have all the power plugs in securely, eg motherboard main and extra 12v, power card's PCIe power, and all cooling fans power connections?
Have you removed and then re-seated the graphics card, making sure it clicks into place?