I could stating the obvious here but did you install the USB driver? Mine was on the memory card in the software focus. If not Google 3d printer USB driver.by Wired_Bob - General
I has problem getting mine to connect. When I started a host application the board would reset but didn't respond to commands. I tried several ways to fix. I found a driver on the supplied SD card. I installed and the issue was gone.by Wired_Bob - General