Apple Multiple Scan 17 Display - Manual (Page 38)

There are wavy lines on the screen, creating an optical effect or moiré pattern.
m You may see a moiré pattern while in some resolutions, depending on the
desktop pattern displayed on the screen (the black-and-white checkerboard
pattern frequently causes moiré). To change to another resolution, see
“Changing Screen Resolution” in Chapter 2. To change the desktop pattern,
see the manuals that came with your computer.
There are two very thin gray lines across the screen, one near the top and the other near
the bottom.
m This is a normal characteristic of the Trinitron color picture tube design.
The lines do not appear in any documents you print.
After many hours of use, the screen image appears dim.
m Increase the brightness of the picture to your preference. See “Adjusting the
Brightness of the Picture” in Chapter 3.
Over time, you experience eyestrain.
m Adjust the screen contrast. In a bright room, contrast is usually best set at
maximum; in a dim room, lower contrast is usually more comfortable. See
“Adjusting the Contrast of the Picture” in Chapter 3. Also, be sure to take
occasional breaks to focus your eyes on a distant object.
You don’t hear any sound from your computer.
m If you have connected a sound output cable to the sound output port
(marked by
-
) on the back panel of your computer, the internal speaker is
turned off. To hear sound, you need to have headphones connected to the
headphone port (marked by
f
) on the front of the monitor stand. If you
don’t wish to use headphones, it’s best to disconnect the sound output cable
from the sound output port (marked by
-
) on the back panel of your
computer.
32 Chapter 4