I have a Dell Inspiron 8200 and just upgraded from RH9 to Fedora and tried to use it with my docking station. I have almost the same problem. I have an external monitor, keyboard, mouse, network connection (basically everything plugged into the docking station) hooked up. Right after it prompts you whether or not you want to enter interactive setup, if you let the system continue to boot itself, it puts some funky display bars on the screen and locks there. I never tried it with RH9, but the system would boot fine before it was undocked. I haven't tried to undock it and boot it.
I'm running a dual boot with Fedora and WinXP Pro.
Any suggestions from anyone else who's had & hopefully solved this problem??????