Yeah the only one I have but my son has one too. I got two when I ordered mine. One for me and you guessed. My sons worked out of the box but mine has never functioned correctly. I tried as you suggested Thomas. No joy sadly, though I did manage to make a connection to both Slushy's pool and Eclipse but the unit never hashed anything. That was the first time it has managed to do so. I now believe I got a none functioning unit. 
Have you tried connecting your miner to your sons computer and his to yours? That would be the quickest and easiest way to tell if there is a problem with the unit or the computer.