Apple Macintosh Performa 6300CD Series - Manual (Page 64)

When you start up, a disk icon with a blinking question mark appears in the middle
of the screen.
This icon indicates that your Macintosh cannot find the system software it
needs to start up. One of the following is probably the cause:
m Your computer may be having a problem recognizing external SCSI
equipment, such as hard disks, CD-ROM drives, and scanners. (SCSI
stands for Small Computer System Interface.)
Turn off all external SCSI equipment and disconnect the first SCSI device
in the chain from your computer’s SCSI port. Then restart the computer.
If the computer starts up after you disconnect your SCSI equipment, refer
to the manuals that came with the equipment for 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.
m System software is not installed on the startup hard disk, the system
software is damaged, or the hard disk is not working properly.
Insert the Macintosh Performa CD. Then follow the instructions in
“Repairing a Damaged Disk” to test your startup hard disk and repair
any damage.
If repairing the disk doesn’t help, follow the instructions in the Macintosh
Performa CD booklet to reinstall system software on your startup hard disk.
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