We have a lab of iMac G4/800/Combo's that are steadily getting worse in not waking up once they go to sleep. They are also locking up when the teacher has the student logout. Has anyone else come across this and could it be the battery? We bouth them in the spring of 2003. They had Jaguar and when Panther came, we upped them to Panther. It's been a gradual thing with the sleep issues. Nanc "Sorrow looks back. Worry looks around. Faith looks UP!"