Apple G4 manual

	Troubleshooting	Symptom Charts/ Video - 52
Screen jitter		1 Verify there are no environmental factors causing jitter.

2Check all cable connections.

3Make sure that the video card driver and firmware are updated to the most recent versions.

4Test with a known-good monitor. Replace the monitor, if necessary. Refer to the appropriate monitor manual to troubleshoot a defective monitor.

5Reseat the video card.

6Replace the video card.

7Replace the logic board.