OK: When I go into preferences and go into change the desktop/screensaver settings page, it will automatically crash. I reopen and use the same option, it wll crash again. If i choose different options, such as energy, no problem. What caused me to go into desktop/screensaver? Because after about 5 minutes of idle, the desktop starts to flash. It's so wierd! I switch over to my wife's account - everything is flawless. What can I do to correct this? I my mac mini jacked? or, is there a "system restore" like there is with windows? This started acting up 2 days ago - if i can make it go back to 5 days ago or something, it should correct itself.