iBook (Dual USB): External Monitor Flickers at 1024 by 768 Resolution

This document describes an issue with using external non-DDC monitors with iBook (Dual USB) computers, and provides a workaround.

Symptom

An external monitor connected to the computer flickers when used at 1024 by 768 resolution.

Products affected

• iBook (Dual USB)
• Mac OS 9.2.1

Solution

To avoid the flicker:

• Use a monitor with a Display Data Channel (DDC). Some earlier monitors may not have this feature.
• Choose a smaller resolution in the Monitors control panel, or the Monitor Resolution portion of the Control Strip.