Apple IMAC User Manual - Page 102
Utility on the MacTest Pro CD. See Geometry in the iMac
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Troubleshooting Symptom Charts/ Video Problems - 2 0 Distorted video. Screen geometry is out of adjustment or screen is out focus. 1 Adjust the focus using the Display Adjustment Utility on the MacTest Pro CD. (See "Focus" in the iMac Adjustments chapter for instructions.) 2 Adjust the screen geometry using the Display Adjustment Utility on the MacTest Pro CD. (See "Geometry" in the iMac Adjustments chapter for instructions.) 3 Adjust the cutoff or white balance using the Display Adjustment and Display Service Utilities on the MacTest Pro CD. (See "Video" in the iMac Adjustments chapter.) A a thin, white horizontal line scrolls from top to bottom, or bottom to top on the iMac display. 1 Adjust the cutoff and white balance using the Display Adjustment Utility on the MacTest Pro CD. (See "Video" in the iMac Adjustments chapter for instructions.). 2 Replace the analog/video board. Refer to the Service Parts Database for the correct part number, there are two versions of the analog/video board.