X Server Configuration?

[Nathaniel Stickney <firewielder gmail com>]

Yesterday afternoon I
installed Fedora Core 4 on my main desktop, and as far as I can tell,
everything is working correctly, but I cannot get any GUI sessions
started, and I get a message "I cannot start the X server (your
graphical interface). It is likely that it is not set up correctly.
Would you like to view the X server output to diagnose the problem?"
when I reboot; choosing <Yes> leads to a text login prompt;
<No> does the same. I have not used Linux in a few years (due to
being on a restrictive DoD network), but the Suse 9.0 that was on my
computer before and a Knoppix disk both worked fine with my hardware -- relevant parts listed
below.

ABIT NF7-S v2.0 motherboard, bios 27
3x 512MB Corsair PC3200 ram
ATI Radeon 9800XT video card
Western Digital WD740GB and WD2500JB hard drives

Any ideas would be tremendously appreciated!

-- 
-Nathaniel H. Stickney

Amendment II:
A
well regulated militia, being necessary to the security of a free
state, the right of the people to keep and bear arms, shall not be
infringed.