Hello, I'm trying to solve this problem, but I wanted to post it just in case someone else is seeing similar behavior.
After a successful fresh install of FC2, the system would hang on the graphical boot screen.
Pressing Ctrl-Alt-F1 to switch to the console showed the boot process hung after displaying:
1. Kernel boot message
2. "Welcome to FC2, press I for interactive setup"
3. Starting USB controllers [OK]
4. Mounting USB filesystems [OK]
My MB is a Soyo KT333 Ultra Platinum with two rear USB 1.1 ports. I also have a multi-function floppy-bay card reader with 2 USB 2.0 Ports.
One rear USB port controls a mouse (no problems). The second USB port connects to an external USB 2.0 hub. The hub has four ports and currently I have a USB scanner (UMAX Astra 2000U) and USB printer (HP LaserJet 2200D) connected to the hub.
First, I disconnected the floppy-bay card reader with 2 USB 2.0 port. I removed its connection to the motherboard.
Reboot, still hangs.
Next, I unplugged the hub. Reboot, SUCCESS. FC2 boots to login screen. Here's the funny thing: If I reconnect the hub AFTER the system boots, everything is fine: the scanner and printer work automagically (ok, I did have to configure the printer).
So, as long as I remember to disconnect the hub before booting, it works.
No permanent solution, but if you FC2 hangs after install, you may want to try disconnecting any USB hubs until this problem is fixed.
Finally, I have not done 100% conclusive testing. This could be another intermittent problem unrelated to the hub or the USB subsystem. But disconnecting the hub and rebooting has always worked for me.
Please note that I ran FC1 with this exact same hardware and I never had any problems.
The USB 2.0 HUB is made by Stratitec: