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Troubleshooting Symptom Charts/ Video - 52
Screen jitter 1 Verify there are no environmental factors causing jitter.
2 Check all cable connections.
3 Make sure that the video card driver and firmware are
updated to the most recent versions.
4 Test with a known-good monitor. Replace the monitor, if
necessary. Refer to the appropriate monitor manual to
troubleshoot a defective monitor.
5 Reseat the video card.
6 Replace the video card.
7 Replace the logic board.