I am Jimson from the Dell social media outreach team.
We can suggest few checks in you system and then we can determine whether it is a software issue or hardware issue.
*Please confirm whether the USB devices that you are trying to use are USB 3.0 or 2.0.
*Update the chipset drivers.
Please follow the Dell link below for Driver downloads.
Please choose your country and service tag of the computer to access.
***** Kindly do not post any personal Identification on the post *******
Certified Dell Community Professional.
Edited by hamluis, 05 July 2012 - 12:44 PM.
PM sent re auth rep status - Hamluis.