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Does it require both 6 pin connectors in, and must i uninstall old drivers? Also, where is the motherboard bios?Make sure you have the power connected to the 460 correctly, try clearing the motherboards bios.
100% needs both connectors. You haven't even booted in to windows have you? so drivers will not be the problem. You can enter the bios by repeatedly hitting the appropriate key, usually delete or F2 as your PC boots up, try reseting to bios defaults.
You going to RMA then, for the best I guess.