I have just updated my iMac G5 to 10.5.6. When I restart, it hangs on the blue screen before log in. I have restarted in Safe Mode (no problem there) and removed the APE files in the library folder, as suggested on support.apple.com. I have also repaired permissions and verified the drive. Still no luck. Is it really possible that the computer needs hours to restart after the update? And would it be better for me to restore using Time Machine or do an Archive & Install with the Leopard discs? The computer was acting a little funky before I updated to 10.5.6 (iTunes was sluggish), but I never had a problem rebooting.