Right I'm replacing my 3450 with a nivida 8800 , my psu in the other rig is 400w and dose not have a pci-e power wire, I did by a dule 4 pin molex to pci-e wire but the card will not work even with all the hard drives unplugged , looking at the molex to pci-e wire it looks like it's missing a wire ( bottom row middle wire, could this by why it will not work also what wire is missing ? also tryed useing two diffent rails.