Apple 640 manual Macintosh hangs or freezes during startup

The Macintosh “hangs” or “freezes” during startup.

If the Mac OS is sharing 16 MB or more of memory with the PC environment, and Disklight of Norton Utilities 3.1.1 is installed, the computer will freeze during startup. This does not occur with 8 MB or less shared memory. Restart the Macintosh using one of the techniques described in “Start Over” in the section “If You Have Trouble,” earlier in this chapter. Also open the PC Setup control panel and change the shared memory setting to 8 MB or less.

The hard disk icon does not appear on the desktop.

If you don’t see a hard disk icon on the desktop, try the following:

mIf the hard disk is internal, shut down your computer, wait at least 10 seconds, and then turn it on again.

mIf the hard disk is external, make sure that it is turned on and that its cable is connected firmly; then restart the Macintosh.

mCheck the ID numbers of all SCSI equipment connected to your computer. See the manuals that came with your SCSI equipment for information on setting SCSI ID numbers.

mIf the hard disk is your startup disk, start your computer with the Macintosh Peforma CD. (For instructions on how to start up your computer from the CD-ROM disc, see “Starting Up From a CD-ROM Disc” in the section “Repairing a Damaged Disk” later in this chapter.) Then follow the rest of the instructions on repairing a disk to test your startup hard disk and repair any damage.

If repairing the disk doesn’t help, follow the instructions in “Installing or Reinstalling Mac OS System Software” later in this chapter to reinstall system software on your startup hard disk.

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