i had an hd 5570 card which did not require an external power supply which got damaged so they replaced it with an xfx hd 5770 which requires an power supply , when i just inserted the hd 5770 card in the pci -e slot wihout connecting the 6 pin connector the card fan spins but no output is displayed , so is the card defective again or i should get an newer corsair power supply and try ?