I was having problems with my Airport and had to give up and call Apple. Got a tech in India, but he was helpful. While we were waiting for an action to happen, I told him about my problem with my mouse and keyboard, and he suggested that I just unplug any USB and I'd have no problems. Can't tell yet if it works as well as unplugging the iMac for an instant prior to reboot, but thought I'd pass it along. Pat