Apple 3400 Series manual External monitors

The screen flickers.

mAdjust the brightness control (¤).

mOpen the Monitors & Sound control panel or use the Control Strip to set the computer to display fewer colors or grays.

mIf 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.

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 Contact the program’s manufacturer to see if there is a newer version of the program that is compatible with dimming.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.

External monitors

The monitor remains dark.

Shut down the PowerBook, then make sure the monitor is connected to the PowerBook, 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.

mUse the Monitors & Sound control panel to select a resolution that will display on the external monitor. If the resolution is not 800 x 600 at 60 Hz, the PowerBook’s screen goes blank when the external monitor is in use.

mScreen dimming may be on. Move the pointer to restore the screen’s brightness.

mAdjust the monitor’s brightness and contrast controls.

mUse the Control Strip to change the resolution on the external monitor. If you still don’t see an image, there may be a problem with the monitor.

mIf you are using an Apple monitor with a 15-pin connector, be sure that the video adapter that came with your computer is connected (between the monitor cable and the PowerBook’s external monitor port).

Tips and Troubleshooting 109