I had a problem after I added a hard disk to my G4, with my Power On button. When I pressed it, it would light up, but when I released it, it would go off. I read that the electrical connector to the button is poor; I wiggled the wiring at the back of the button & now I can wake up after a shut-down. Peter J. Carian Sr Engineering Specialist Electronics Systems Division The Aerospace Corporation 310-336-8215 Page: 800-985-8308