Unfortunately it seems you ve had bad luck with the board ,it may have issues with the USB3.0 controllers.
Had similar problems like you with a board version 1.0.I sold mine some time ago.
Issues with controllers would occur with Windows XP most of the time and more rarely with W7.
The yellow bang/inability to use the ports would occur randomly and you may notice this only by looking in the Device manager.
In my case one of the Etron chips would do it more often ,was the front panel one.
But issues with the controller drivers can have a source in a conflict with AMD drivers as well ,issue may not be at hardware/BIOS level.Some people reported this along the time with the board.The order in which you ve installed drivers at the OS clean install can play a role here.
I would recommend a clean OS install having the drivers close for use before going online.
Try installing the USB 3.0 driver before all the others and DO NOT install the AMD filter driver from the chipset package.Uncheck the item at AMD driver wizard launch.
If you are NOT using a FX CPU try BIOS F5 ,if you are using the first revisions (1.x) of the board.
MisterEd your board is a totally different story ,the PCB is different