I wanted to start this thread as a warning, as well as a prevention mechanism. I own an iBook G4 recently purchased in March (thus, the previous rev.)(see sig for specs). Upon installing the 10.3.4 update via the software update panel, my computer WOULD NOT START UP. I worked for 4 hours with two, very skilled Mac-enthusiests. We tried all sorts of things, an abbreviated list: - repairing permissions - repairing disk - booting in safe mode - fsck -y -f - zapping pram - resetting PMU - clearing NVRAM etc, etc. To no avail. My computer would not boot, no matter what. Luckily enough for me, I was able to boot in Target disk mode and copy all my data to an external drive (via another mac). I don't know how may late-comers using iBook G4's there are to the update, but use it with caution. Apple currently has no fix for this error, and AppleCare suggests wiping internal drive and reinstalling. Although I remained calm throughout the process because i knew i wasn't going to lose any data, this just should not occur. I needed to wipe my drive and reinstall everything. /useful post begin rant Several things here really bother me. 1) This update shouldn't have left the developer's floor with such glaring errors (there are several threads on Apple's support pages with other users having the same issues). 2) I became aware of an iBook G4 graphics update during this process. This was a computer specific update and would have been really nice to know about. However, updates of this nature are not found in the Software Update panel. They should be.