I have a G4 iBook with a 1.07 MHz CPU, 1GB RAM, 60GB HD running Leopard OS X 5.2. It has been running like a charm, and suddenly, the screen image starts moveing with the mouse - the desktop, all open windows, websites, everything. You can drag it to one side or the other, and still open and close applications, use them, use the web, send and received emails - everything, but the screen moves around with the mouse, and it is driving me crazy! I have tried resetting all the settings - Power, Display, Appearance, etc. I have reinstalled OS X 5.2 I have run Disk Warrior and got some errors: "User differs on "Applications/ical.app/Contents/MacOS, should be 0, user is 502", and then several similar error messages regarding "Resources", always with "should be 0, user is 502" In Macintosh HD/Users/oBookg4/Library/Preferences/ , Disk Warrior detected that "the Property List data is damaged and cannot be repaired" "XML parser error: Unexpected character at line 1" Everything else looks OK. Any ideas?