All fans are spinning, the 6-pin is plugged into the card, and it is firmly seated but no display. I cannot locate the 9800gt on my computer, even with driver updates and device manager(however BiosAgent can locate it and says i'm missing the driver). I haven't any clue.
If you were previously running onboard graphics, you may have to go into the bios and designate the pcie as your primary graphics adapter. Some systems do it automatically when you put the card in the slot, some dont.