My graphics card wont work

I just got an ati radeon hd 4850 and a new 500 watt power supply to run it. I installed both of them and turned on my computer everything ran but the screen stayed black and the computer didnt boot up. i meet al the requirements to run the thing, ive googed everything i can think of, asked everyone i know, and now im asking the internet. help me out please if this doesnt work im gonna have to take my computer to someone who knows what there doing.
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  1. I'd just double check all the connections before doing anything extreme.
  2. That was one of the first things I did
  3. Can you undo this installation? Try reinstalling your new graphics card.
  4. if by reinstall you mean take it out so i can mess with the computer then yes ive done that
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