New card trouble

So, I put my new video card into my computer, and when I tried to turn on my computer I got a black screen with a "0_" in the bottom right corner and the LED on the board reads "00". I can hear windows start up in the background and the screen stays the same. I have also tried it without either of my hard drives plugged in, and it didn't change anything, but when I put the old card back in everything works completely fine. In fact I am using the old card right now as I type this. Does anyone have any suggestions on how I may be able to fix this or as to what the issue may be?

Use a different display adapter? maybe