"reseat", not reset.
Pull it out the slot, reseat again.
Just something to try if the card hasn't moved for some time.
In YOUR case, that might not be an issue. But try the PRAM reset anyway.
That's NOT just for the graphics card, but is a hardware reset for the NVRAM.
If you need to know how to do that, it's simply holding Option-Command-P-R on a restart.
You will hear the boot chime, so keep holding the same 4 keys until you hear the chime 2 more times, then release the keys.
You can also do an Open Firmware reset (which I usually do first on a PPC Mac)
Restart, holding Option-Command-O-F (that's the letter Oh, btw.
)
You should see a couple of lines of text, then a text prompt.
Type reset-nvram, then press enter. You should get an OK
Type set-defaults, and again press enter. You should again get an OK
Type reset-all, and again press enter.
Your Mac will restart then.
I usually will then do the PRAM reset at that time. It's not terribly important if you have already just done that PRAM reset.
Should restart - all assuming that you can see anything on the screen. (I have done the open firmware reset, even with a blank screen. You know if it completes, with the last reset-all, when you should get a boot chime as your Mac restarts.
If the video still doesn't come on - try replacing all the RAM with known good RAM sticks. You should only need one good pair, as you are just trying to get it to boot with working video.
Video working now?