There are 2 USB ports in the back, make sure you plugged into the correct port and your not in the IPhone one.
I did and thanks for the suggestion. I was able to finally get it to work, been trying for 3 days. apparently the different cables I was trying to use were not the "factory issued" cables that came for the Note 5. I grabbed my GF's cable that came with her Note 4 and it connected right away. so if anyone is trying to use a standard USB cable, you may have issues connecting. Now I just gotta order some Samsung OEM cables.