Question Details:

I just put in a Firewire PCI card. Now when I go to start it up, I don't get anything on the screen at all, but it does turn on however. I've tried removing the PCI, trying again, but it does the same thing now.

Answer:

It is possible to damaged some component on your computer was damaged during the proccess of Firewire PCI installation. The symptoms you are experiencing are indicating a dead videocard or motheroard. Or maybe a display problem.

Check out here to learn how to troubleshoot a dead computer.