GA 7N400 Pro2 F_USB problem

The front USB connectors on my case are (as far as I can tell) correctly
connected to the F_USB plug on the mainboard. However, USB devices that I
plug into the front case connectors either produce a "USB device not working
properly" error message or are not acknowledged at all. The USB connections
on the rear ATX cluster are fine. Problem exists with Windows XP and Windows
XP SP 2. I suspect a driver problem but have no idea how to resolve it.

What should show up in Device Manager? I don't see anything with "USB2" in
the device name. What drivers should the various USB components be using? If
anyone has this board and knows that their F_USB is working OK, could you
see what your device manager says?

Thanks,

--
John Goulden