disconnect.

Hi, I have a GA-H77N with i3 3225. My problem is that my usb 3.0 ports and 2.0 work fine but when I put a 2.0 device in a 3.0 port then it doesn't power it and detect it. I'm not bothered about 3.0 to be honest, but if I can keep it it would be nice. How do I fix my issue? Thanks E.