Apple PowerBook (Duo, 2300 Series) - Manual (Page 103)

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. (Or use the optional recharger.)
The screen flickers.
m Adjust the brightness control (¤) to the right of the display.
m Open the Monitors control panel and 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.
The computer freezes when screen dimming takes effect.
m Screen dimming does not work with some programs. Open the PowerBook
control panel and turn off screen dimming.
External monitor (connected to a dock)
The monitor remains dark.
m Shut down the Macintosh PowerBook, then make sure the monitor is
connected to the dock, plugged into an active outlet, and turned on. (Most
monitors have a light on the front panel to show whether they are on.)
The monitor is on, but no image appears.
m Screen dimming may be on. Move the pointer to restore the screen’s
brightness.
m Adjust the monitor’s brightness and contrast controls.
m Open the Monitors control panel and press the Identify button. The
number on each monitor icon should appear on the corresponding screen.
If not, there may be a problem with the connection, or the monitor may
need repair.
95 Tips and Troubleshooting