USB C - Getting power but devices not launching

[SuperheroRobot]

My USB C and USB 3.1 ports are producing power, but no devices (hard drive, phone, tablet, etc.) are launching. Any tips?

My mother board is a Gigabyte GA-Z170X-Gaming 6.
Running macOS 10.12.5

Thanks.

 

[SuperheroRobot]

I booted my computer with the USB C device plugged it and now it is launching. When I do speed test, USB C and USB 3.1 are much slower than USB 3. Any tips?