Troubleshooting Symptom Charts/ Video - 51
Distorted Video 1 Make sure that the video card driver and firmware are
updated to the most recent versions.
2 Refer to the adjustments section of the service manual or
owner’s manual for the monitor. Adjust monitor as
necessary.
3 Third-party monitors: Try a known-good monitor.
4 Reseat the video cable.
5 Reseat the video card.
6 Check the video adapter, if present. Refer to “VGA-to-
Macintosh Adapter” earlier in this chapter.
7 Replace the video card.
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