Apple M9388LL/A Service Guide - Page 186

4. Replace adapter cable. 5. Replace logic board. The display is rolling (PAL instead of NTSC) 1. Make sure you are not using Apple's A/V Video Cable. 2. Make sure you are using the S-Video and Composite adapter cable. 3. In Mac OS X, go to the Displays system preference to change the setting. 4. Try a different TV or VCR. 5. Try a different adapter cable 6. Replace logic board. Display shows ghosting (signal reflection) 1. Verify that cables are correctly installed and firmly seated. Check cables for damage. 2. Replace video adapter. Video (VGA adapter) No video on an external device 1. Verify monitor that is used in testing is known-good and is supported by this computer. 2. Try known-good VGA adapter. 3. Replace logic board. 4. Replace VGA adapter cable. 5. Replace logic board. Display shows ghosting (signal reflection) 1. Verify that cables are correctly installed and firmly seated. Check cables for damage. 2. Replace video adapter. Misc. Symptoms The computer runs with battery, but not with the power adapter plugged into wall outlet 1. Try known-good power outlet. 2. Try known-good power adapter and power cord. Note: Verify that power adapter connector glows amber or green. If the power adapter light is green, turn over the computer and press the battery button. The 12 - iBook G4 (14-inch) Troubleshooting Symptom Charts