sorry to hear it....
The question becomes.. would you rather have a refurbed board (assuming that's what they give you) or your existing board .. with who knows what having gone wrong?
If you want to stick with your existing board.. I would do the following...
1) disconnect all of your usb devices.. and any front usb ports from the motherboards usb headers...
2) then Go into the the system folder/device manager under control panel.. and remove/uninstall any USB related device...
3) reboot windows, and let the operating system rediscover/install them.. and then see if they work....
Aside from that.. for peace of mind.. you may want to
1) run a stress test (Prime95 or Orthos)against your machine to ensure it's running as it should..
2) as well as MEMTEST to test the memory...
3) and possible a Video stress test ... and if those 3 all run ok. .then I would feel comfortable that the problem is
4) run a CHKDSK against your drives to ensure nothing was corrupted as well
If all of those check out ok.. then I would feel pretty comfortable that the board is ok, other than the USB section....
Mike