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Hi,
This is one of those stab in the dark questions. Each device you add takes some power, so is it possible you are overloading an overtaxed power supply? What brand name and wattage are you using?
Second thought, did you load the chipset drivers when you installed the motherboard.
Third thing, when you go to Start, Control Panel, System, Hardware, Device Manager, do you see any yellow or red question marks that might indicate problems with already installed items?
What happens when the USB device is already connected when you boot up?
Post back when you have had a chance to look at these possibilities.
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