When updating Macintosh system software to version 6.0, be sure to start up
from the System Tools disk. Do not just switch-launch to it. Without a
clean restart, programs and INITs can interfere with proper installation.
After performing what seemed to be proper installations on a variety of
Macintoshes, engineers were getting consistent (though sometimes
intermittent) error messages when restarting the systems. The errors
included:
- "Unable to load needed resources" on startup.
- ID errors 02, 07, 10, 11, etc. when running applications or performing
simple events.
- RAM Cache could be changed only to 1596.
These errors varied, depending on the type of Macintosh on which the
installation was performed and the types of CDevs and INITs contained
in the System files when upgraded. For example, it mattered if either Menu
Clock or Vaccine (even though turned off) were present.
The above errors disappeared after deleting the recently updated System
Folder, restarting the Macintosh with the System Tools disk, and
reinstalling the software. Therefore, always start up from the Installer
disk when installing or upgrading software to ensure a complete
installation takes place.