When a patron tried to use the webcam today he got a message saying that it was not connected. The green light on the cam was off and when I checked the outlet strip under the carrell, the cam's power supply had been disconnected (accidentally, I'm sure). But after I plugged it back in, Yahoo Messenger still said the cam was disconnected. So I unplugged the webcam's USB cable in the back of the tower, plugged it back in, and viola! Live video. There are two USB cables that plug in the tower. I didn't know which one it was so I tried them both!