I just did a fresh install of Fedora Core 5. After rebooting, the startup progresses normally with all of the critical services starting just fine.
After the last service is started, the screen blanks to the off-blue color that Core 5 uses, then goes to a nasty shade of intense vertical green. Nothing that I've tried has managed to get out of the "Green Screen of Death".
I suspect that the selected screen resolution (1024x....) is more than the graphics card handles by default and that I need to update the drivers.
But until I can get a terminal session to work I can't even edit the Xconfig files.