Gpu wont work when plugged into

I just bought and built a new PC.
Everything is working great, except for when i try and use the ports on my graphics card, I get a blank screen. I bought the Nvidia Geforce 570.
I have a 750W power supply, so I dont think thats the issue, I set my motherboard to use PCI express for graphics, but that doesn't change anything. I'm at a loss can you please help me?
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More about wont work plugged into
  1. Have you plugged in the PCIe power cables to the 570?
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