In system prefs I select OS 10.0.4 as my start up. Then I quit prefs. When I open prefs again, 9.2.1 is selected. If I restart with 9.2.1 selected, I am back in OS 9.2.1. I have to reinstall 10.0.3 etc to get back to OS 10. Basically Ileave my computer running 24/7 because I will loose OS...