PowerMac G4 (FW 800) Won't Start After Installing Airport Extreme Card!

After installing an Airport Extreme Card in my G4 FW 800, the computer will not Chime or Start Up; shortly thereafter, the Fan begins to Run erratically.
Without the Airport Card installed, the CPU runs normal, with the exception of the clock needing to be reset.
Any help is Greatly Appreciated! -Nico

Hey Tom, thanks for the response. I have tried holding Command-Option-R-P down (resetting the PRAM) at startup with no avail. I have also pressed the PMU button with and without the Airport Card installed. Still no luck. I am pretty stumped. I ran a hardware check on the machine, and it has come back successful without the card.
The previous owner installed an extra internal HD and some memory. I have since installed a new PCI graphics card. Do you think these have anything to do with it?

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