Hi, My iBook G4 has had some strange problems recently. Firstly quite a few applications aren't working (examples are AppleWorks, NeoOffice, Preview but others like Stickies and iPhoto are fine). The volume controls aren't doing anything, and it can't be shut down (the button and the option on the Apple Menu do nothing). These have rendered it near useless. I've got an appointment in the Apple Store booked, but are there any ideas of something I can do that may sort it out?