Apple PowerBook (2400c) - Manual (Page 95)

PowerBook display
The screen went blank.
m Screen dimming may be on. Move the pointer to restore the
screen’s brightness.
m The computer may have gone to sleep. Press any key (except Caps Lock)
on the keyboard to wake it.
m The battery may need recharging. Plug in the power adapter, let the
battery charge for a few minutes, and then try to wake or start up the
computer again.
m If an external monitor is connected, the image may be displayed on that
monitor and not on the PowerBook’s display. (If the external monitor is set
to a different resolution from the 800 x 600 pixels of the PowerBook
display, the computer’s image only appears on the external monitor.)
The screen flickers.
m Adjust the brightness control.
m Open the Monitors & Sound control panel or use the Control Strip to set
the computer to display fewer colors or grays.
m If tilting the display affects the flickering, there may be a loose cable.
Contact an Apple-authorized service provider, or call the Apple
Assistance Center at the number provided in the resource materials that
came with your computer.
The computer freezes when screen dimming takes effect.
m Screen dimming does not work with some programs. Contact the program’s
manufacturer to see if there is a newer version of the program that is
compatible with dimming. If the problem persists, you can open the
PowerBook control panel and turn off screen dimming.
95 Tips and Troubleshooting