MSI x99s USB Problems

[FireCatch13]

Since I have built my computer, I have been coming up with two error codes on boot, B4 and A2. I had just ignored them because links on the internet just suggested usb error, I can live with that. But when I bought a new logitech mouse set that uses the unifying receiver and plugged it in, the keyboard does not work when the dongle is plugged into the rear I/O port (USB 3), however works perfectly fine in the front USB 3 port. Upon further research I decided to update the bios because others had said that had solved their problem, however now I still get the B4 and the A2 error along with a new 9c error code. How can I fix this? Is there something wrong with what I have plugged in or even my actual motherboard? (I have an MSI x99s SLI Krait Edition running an Intel i7 5820k, and currently have only a printer connected to one of the back USB 3 ports, and the unifying receiver in the front port.)