My Mac suddenly decided to get everything back on default settings. First it started with iChat, it went back to settings where the peoples names didn't even show up. My iTunes music library was completely lost and none of my pictures showed up, unless I searched for them. I tried restarting, and it came up on default settings. The color is all blue and weird and the icons are huge. I tried to change them but I can't even go to Calbirate colors because it says its not compatible with what I am using. I absolutely have no idea how this randomly happened. The color is rediculously blue and there is no way to change it. Is there a way to get it back to how it was? I have no idea what to do. I have pretty much lost everything. Its an OS X 10.4.11. Any help would be very much appreciated!