Apple twentieth anniversary mac Service Manual
When you start up the computer, you see a message about the system software.
m The system software on the startup disk you’re using may be incomplete or damaged or may be the
wrong version. Make sure you’re using the correct disk as a startup disk.
m If you’re sure you’re using the correct startup disk, you may need to reinstall system software. See
“Installing System Software” in Chapter 13.
When you start up, a disk icon with a blinking question mark appears in the middle
of the screen and stays there for longer than 15 seconds.
of the screen and stays there for longer than 15 seconds.
This icon indicates that your Macintosh cannot find the system software it needs to start up. One of the
following is probably the cause:
following is probably the cause:
m Your computer may be having a problem recognizing external SCSI (Small Computer System
Interface) equipment, such as hard disks and scanners that you may have connected.
Shut down your computer, turn off all external SCSI equipment, and disconnect the first SCSI device
in the chain from your computer’s SCSI port (marked with the g icon). Then restart the computer.
If the computer starts up after you disconnect your SCSI equipment, refer both to the manuals that
came with the equipment and Chapter 9, “Connecting Additional Equipment,” which has
information on the proper way to connect SCSI equipment and assign SCSI ID numbers.
in the chain from your computer’s SCSI port (marked with the g icon). Then restart the computer.
If the computer starts up after you disconnect your SCSI equipment, refer both to the manuals that
came with the equipment and Chapter 9, “Connecting Additional Equipment,” which has
information on the proper way to connect SCSI equipment and assign SCSI ID numbers.
If you have a printer connected to your computer’s SCSI port, make sure your printer is connected
properly. Most printers connect to the printer port, not the SCSI port. Check the manuals that came
with your printer for information on how to connect it properly.
properly. Most printers connect to the printer port, not the SCSI port. Check the manuals that came
with your printer for information on how to connect it properly.
m System software is not installed on the startup hard disk, the system software is damaged, or the
hard disk is not working properly.
Follow the instructions in “Testing Your Hard Disk,” in Chapter 13, to test your startup hard disk and
repair any damage. If repairing the disk doesn’t help, reinstall system software on your startup hard
disk. For detailed instructions, see “Installing System Software,” also in Chapter 13.
repair any damage. If repairing the disk doesn’t help, reinstall system software on your startup hard
disk. For detailed instructions, see “Installing System Software,” also in Chapter 13.
Solutions
to Common
Problems
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