Troubleshooting Symptom/Cure Tables: System Problems After Startup - 31
Distorted Video
Distorted Video refers to a problem with the screen geometry or focus.
Possible Cause Possible Fix
System is out of focus. Adjust the focus using the Display Adjustment Utility on
the MacTest Pro CD. (See “Focus” in the iMac
Adjustments chapter for instructions.)
Screen geometry is out of
adjustment (display is off
center, sides or top of the
screen are not straight,
etc.).
Adjust the screen geometry using the Display Adjustment
Utility on the MacTest Pro CD. (See “Geometry” in the
iMac Adjustments chapter for instructions.)
Screen cutoff or white bal-
ance is out of adjustment.
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
for instructions.)