Apple Mac Performa 5300CD - Manual (Page 65)

Solutions to common problems
This section contains descriptions of problems you could experience with
your computer. Some problems may be caused by your CD-ROM drive, so if
you don’t find your problem here, be sure to check the section, “Solutions to
CD-ROM Problems,” later in this chapter.
The computer is turned on but the screen is dark.
One of the following is probably the cause:
m You have a screen saver program that darkens the screen when the
computer has not been used for a certain period.
Press a key or move the mouse to turn off the screen saver.
m The screen control buttons (¸) are not adjusted properly.
Press the top screen control button to lighten the screen.
m The Macintosh is not getting power.
Check that the computer’s power cord is firmly connected to the computer
and plugged into a grounded electrical outlet, and that the outlet has power.
If you are displaying video from your computer on a television screen, it is
normal for your computer monitor to be dark.
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.
Vertical centering control
Horizontal centering control
55 Troubleshooting