I have a G4 Powerbook running 10.2.5 and all of a sudden my energy saver preferences are all greyed out and the optimize energy settings are set to Presentations and under details everthing is greyed out for the sleep options so I can no longer adjust anything. Also if I hit show all it locks up my system preferences and I have to force quit. What happened??? Is there a way to fix this? Thanks for any input...