I've been a PC user for years and just got a MAC G4 with OS 10.1.2 on it. I did all the upgrades so now I have 10.5 I have tried numerous times to upgrade to 10.2.3. The install goes fine but when it reboots I get an error in the top left corner. SOmething like sh.2-05# Not sure if that's right but anyway Iwas told that is a hard drive error. I ran the disk utility and found no errors. I have reformatted the drive and tried again. THe 10.5 runs fine with noeros or problems. Why am Igetting this error and lockup when I upgrade? I need t oupgrade so I can run certain apps. Thanx in advance!