Hi, I want to thank everyone who gave me suggestions on why my G4 was freezing and how to fix it. With everyone's help, I think I narrowed it down to my USB hub. After unplugging the hub and plugging the keyboard into the computer everything is working again (no freezes yet). Until I get another hub, I have to unplug the printer to use the digital camera, and vice versa. The Hubmaster by Pertech was recommended to me as one of the most reliable hubs, so I'm going to buy it this week. Thanks again for your help. Sharon