After trying EVERYTHING suggested, I was still unable to "make contact ". I then remembered I’d gone through something like this before and after swithing to a different USB Port I had instant success! I was using a 4-Port USB Hub (USB 2?) but without success. After plugging into a Port directly on the back of the tower it worked. I had this problem before with a USB mouse. It refused to work on the back USB Port but would work fine on the front Port. Freaky!