So, my ibook g4 has been causing major problems for me. Basically, the file systems have been corrupted 3 times and disk warrior has to be used to repair the system, and I've lost all my information these times. It happened yestarday after I inserted a cd and tried to burn it, although this time instead of getting a question mark on boot, it would hang on the grey apple screen then shut down. I brought it to apple, they were able to recover my files and said that the only thing they saw was that a human interface device was causing the problems. I only use a bluetooth mouse/keyboard. in my usb, i have an external dvd drive and hard drive. They mentioned it could be my physical keyboard. Is there a way to check for this? Right now, I can't afford to send in my computer because I need it for finals, so if it happens again, I'm just going to reformat the drive again. Any advice?