CarmenC, please take into consideration that it is always possible that third party equipment or components are not always (fully) compatible with Intel products.
The following link will show you the list of tested components on this motherboard.
http://www.intel.com/support/motherboards/desktop/db-db85fl/sb/CS-034270.htm
Would you please provide me the complete model number of the 3.5’’ HDD USB device you are using?
Also, there is a new BIOS version available (0121). It was released on October 14, 2013. You may want to give it a try. Download Center
Let me know the results.