New Graphics Card, But Just Have Black Display

Hello, I recently received a Radeon HD 7950 from a friend and wanted to add it to my rig. However, after plugging it in the slot, with sufficient power and correct cords, I would get a blank, black display on my monitor.

I know the card isn't broken, and I also know that the HDMI cable I'm using isn't broken either. Also, if this helps anyone, I can't access my bios at all. My computer will boot up and instantly, and I mean instantly load the log in screen, so I have no time to enter in the keys neded to access BIOS. I'm running Windows 8 by the way.

Having said this I was wondering what is wrong with the thing?
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