K7N2 USB Question

My device manager shows 6 unknown devices in the Universal Serial Bus controller. Right now I have no usb devices installed in the system. There is no yellow ! on them. Any known issuse???

Standard Enhanced PCI to USB Host Controller
Standard OpenHCD USB Host Controller
Standard OpenHCD USB Host Controller
Unknown Device
Unknown Device
Unknown Device
Unknown Device
Unknown Device
Unknown Device
USB Root Hub
USB Root Hub
USB Root Hub
The unknow devices have no Yellow !, but when I plug any usb device in one one unknown device changes and becomes that device pluged in.
I know it sound strange, but it what I see.

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    Quote
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