Well, the mouse and keyboard are USB but there aren't any other USB devices connected. I did, however, plug the printer into another USB port but had the same result. I've changed the USB cord twice to be sure I didn't have a faulty connection. The computer isn't usually connected to the Internet - it is used primarily to write music using FINALE and the printer was purchased because it has the ability to print on both sides of the paper. Plus, it doesn't use up all those ink cartridges the old inkjet printer did. Thanks . . .