Some motherboards have been known to have issues with certain types of USB devices plugged in on startup. You'd be surprised just how common this type of issue has popped up over the years. Unfortunately this type of issue is going to be manufacturer specific so there are only 2 entities you can contact to fix this. It will either have to be the manufacturer of the device (which odds are slim to get help from them, especially if this issue only effects your specific motherboard), or more commonly the motherboard manufacturer. Usually a BIOS update. You can try updating your BIOS now to see if they've already addressed USB based issues. If the problem remains, I suggest creating a thread on the motherboard manufacturers forums to bring attention to the issue. As I said, USB device related issues on certain motherboards is a common occurrence. I've ran into several over the years, and it's always taken a BIOS update to fix it. If the issues you were experiencing were while you are in Windows, then you would have more avenues to explore, but since what your describing is a POST boot lockup, then you have to go through the motherboard manufacturers support forums.
As a temporary solution, most of these issues I've seen in the past, only effect POST lockups. Usually you can unplug the device until windows boots, and then plug the device back in and use normally, usually without any further issue while the machine is running. But you'll have to unplug the device every time you boot the machine again or risk another lockup.
Hope this helps.