I made the mistake of running Software Update and installing the Quicktime 7.2 and iTunes 7.1.3 updates last night. Following the installation, the G5 iMac running OS 10.4.10 would not boot up, hanging at the progress bar with the blue background and never bringing up the user login window. I could boot from my backup 10.4.10 on a Firewire external HD, so I knew the hardware was OK. Running FSCK, Applejack, Disk Warrior, Tech Tools Pro, resetting the PRAM/NVRAM, and repairing permissions did not resolve the problem. After hanging at the startup screen, the computer would simply shut itself off after a while. Eventually I had to reinstall OS 10.4.9 to get things working again. That meant reinstalling my Palm software, Missing Sync, printer and scanner drivers, among other things. I won't be updating to 10.4.10 or Quicktime 7.2 and iTunes 7.1.3 again. Mac's may not have any viruses, but with Apple Software Updates serving the same purpose, who needs viruses? On the other hand, being a Mac consultant, no doubt these latest *upgrades* will generate lots of new business for me, so maybe I shouldn't complain. ;-) Terry