S1200V3RPM beeps during POST

Hi

I have a S1200V3RPM which beeps in a strange way during POST.

The beeps are like this: '''------'  (three short high, six long medium, one short high)

When Windows Server 2012 R2 boots it reports that a USB device failed to load, although no USB devices are connected to the board.

What could this mean?

Thanks