Apple Macintosh PowerBook 150 - Manual (Page 114)

The screen
The screen looks blurred or out of focus.
m The viewing angle may not be optimal. Tilt the display on its hinge until
the screen looks better.
The screen is too dark.
m The screen brightness or contrast may not be optimal for the surrounding
lighting. Adjust the brightness or contrast setting.
The screen flickers.
m This problem sometimes occurs when your screen is set to display the
maximum number of grays. Try adjusting the contrast control, or select
Black & White in the Monitors control panel.
There are ghost images or black dots on the screen.
m When the computer is left on for many hours, temporary images may
appear on the screen. Put the computer to sleep. The longer the computer
was left on, the longer it will take for the images to fade, but they will
eventually disappear.
The pointer moves too fast or too slowly.
m You need to adjust the pointer’s tracking speed. Open the Mouse control
panel and choose a more comfortable setting.
The pointer won’t move at all.
m A software problem may have caused the computer to “freeze.” Restart the
computer by following the steps in “The Computer Won’t Restart” earlier
in this chapter.
m Turn the computer off by pressing the reset switch on the back of the
computer. Then turn the computer on again. You will lose any work that
you have not saved, and you will also lose the contents of your RAM disk.
106 Chapter 9