Attempting to trash relevant files after CD burner software installation failure on my 1998 vintage G4 resulted in a big crash - nothing at all appeared on screen. A technician looked at my problem. My system is OS 9.04 - software not compatible with 9.04 though it said it was compatible with OS9 up, causing an extensions corruption. I now have a flashing question mark/smiley face on start-up. Any advice on how to proceed to get into my system? I want to install a compatible version of Toast instead of the Iomega Solutions software that caused the problems. I have a large amount of data on my desktop. If it is necessary to re-install my OS will I lose this data?