I received my new iMac G5 20" this week and have been fighting with BT keyboard and mouse issues since I first connected the two. I'm using a Apple keyboard and Radtech BT500 mouse. I've read many post over at the Apple Discussions board in the support forms but none helped solve the problem until this morning when Barrett posted what he discovered here. The problem seems to be when the Airport Extreme card is on you can not keep a connection via Bluetooth with the keyboard or mouse. You can either be using just one device or two it doesn't matter. In other works, I've ruled out that it's conflicting with each other. As I posted over at the Apple boards I've had to turn off Airport just to type this message which works flawlessly. I'm asking anyone with the same setup to please check what was found and report back. I might mention that I'm also using two Airport Express' and a Apple Base station in my house.