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The screen image is off center.
If the picture on your screen appears to be off center, use the centering
controls on the back of the computer to adjust it. Use a small screwdriver to
turn the controls.
The computer’s clock keeps time inaccurately.
Your computer has a clock that runs continuously. When the computer is
turned off, a battery keeps the clock running. If your clock begins to keep
time inaccurately, have your Apple-authorized service provider replace
the battery.
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 equipment
that uses the Small Computer System Interface (SCSI).
Shut down the computer, 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 not supposed to be connected to the printer port instead.
Check the manuals that came with your printer for information on how to
properly connect it.
Vertical centering control
Horizontal centering control
74
Chapter 6