Is your computer recognizing the camera? Windows or Mac? I would guess you restarted the computer and still have the same results? Trying plugging the USB in while the camera is on to see what happens, then plug it in off and turn the camera on to see if it sees it. Does the camera have a card reader? USB ports can go bad on computers, do you know that they are working properly?

Great photography is not about being in the right place at the right time, it is about putting yourself in the right place at the right time.