Symptom
A PowerBook or iBook using Mac OS X 10.2 does not go to sleep immediately when you close it.
Solution
Some applications may not respond immediately to system sleep notifications in Mac OS X 10.2. These applications should respond within several seconds, allowing the computer to go to sleep. However, this may cause a delay of up to 30 seconds after the computer is closed.
To avoid this delay, quit any such application before closing the computer. You may need to use a process of trial and observation to determine which applications cause a sleep delay.