You say that you can see the post information, correct?
If so, your monitor should be a 15khz type or you wouldn't even see that.
Is the BIOS on your system one of the goofy GUI types or standard text? If it's a GUI type, it might be kicking the card into an incompatible mode (although this seems unlikely).
Have you tried booting into "safe mode"? What happens then?
Just trying to see what you have tried....
RandyT