I have a G4-dual processor Mac running OS10.4 and it developed several problems. I could not use the Control Ket to get the Contextual Menu and the computer would shut down at 6:44 am every morning while I was using it. So I did an Archive Install and that solved the Control Key problem. Now the dang thing restarts at 6:44am every morning. I do page layout for several newspapers and early mornings are when I work on them. This is driving me nuts