First of all...take a deep breath...we can only read and type so fast
Did you make any changes in the BIOS when installing the new drive such as resetting the defaults, etc?
Go back into the BIOS of your computer, by pressing F2, and look for a option for onboard video. Make sure it's turned off or disabled so that the computer will know to push the video signal to your card.
You mentioned that you tried connecting it to the VGA port on the system board, did you get video when you did this? If so, go into Safe Mode w/Networking, uninstall the drivers for your video card and download and install the latest ones (non-beta).