Michael, if you want to continue this discussion, please answer the questions asked above, namely:
What did you have in your system before when it was working?
What are the complete make and model on new and old cards?
Did you follow the installation instructions to remove the old video drivers, shut down the system, install the new card, and load the new driver when requested?
Alternatively, were you on some onboard video before?
And these new questions:
Does the new card require a 6 pin power connector? If so, does your power supply have one and did you connect it? If your card requires one but power supply did not have one- did you use a 4 pin molex adapter?