usb doesn't work

[rufina sarvarova]

Hello,
I can't find out what's wrong with my configs/computer..
All my USB devices doesn't work in freebsd 8.1. I had windows/ubuntu at this
computer and all works well.
But here.. At bios usb enable, before loading freebsd usb indicator
light-on, but during loading it's turns off.
my dmesg here:

usbus0: <ATI SB400 USB Controller> on ohci0
usbus0: 12Mbps Full Speed USB v1.0
ugen0.1: <ATI> at usbus0
uhub0: <ATI OHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
uhub0: <ATI OHCI root HUB, class 9/0, rev 1.00/1.00, addr 1> on usbus0
usbus0: Root HUB problem, error=USB_ERR_NO_ROOT_HUB

System does not see any usb devices.
 at rc.conf I enabled hald and dbus..