There are vendors out there now that sell what they call "charging" USB cables. what is a "charging" USB cable you may ask? It's one that only has the power lines and not the data lines. Of course, if you try to use one of those you'll get nothing.

On Sunday, June 23, 2019 at 7:34:57 AM UTC-5, Craig Funston wrote:
I found my Nano 4 was very picky about the USB cable I used. You might try several different cables.