User`s guide

Troubleshooting Symptom Charts/Geometry - 5
No raster (screen is
black); power
indicator light off
1 Verify that monitor is connected to live power source, that
power button is on, and that computer connected to display is
turned on.
Important: Be sure the ADB and video cables from the
monitor are connected to the ports on the computer .
2 Check that all internal cables are connected and that CRT/
video board is properly seated on CRT socket.
3 Replace main deflection board. Then adjust the display (see
“Adjusting the Display after Replacing the Main Deflection
Board” in this chapter).
4 Replace CRT/video board only if the service strategy in your
region supports CRT/video board replacement.
5 US only: Call Apple Technical Support at 1-800-919-2775.
No raster (screen is
black) after Restart
1 Turn off the monitor's power button, and then turn it on
again. (This is a quick fix; this symptom causes no
permanent damage to the display.)
2 Replace the main deflection board. Then adjust the display
(see “Adjusting the Display after Replacing the Main
Deflection Board” in this chapter).
3 US only: Call Apple Technical Support at 1-800-919-2775.
Geometry
Shape of raster is
distorted
1 Use Monitors & Sound control panel to adjust the display for
optimum screen performance. If necessary, click Factory
Settings button in Monitors & Sound control panel (refer to
the Adjustments chapter).
2 Replace main deflection board. Then adjust the display (see
“Adjusting the Display after Replacing the Main Deflection
Board” in this chapter).
3 Replace CRT/video board only if the service strategy in your
region supports CRT/video board replacement.
4 US only: Call Apple Technical Support at 1-800-919-2775.
Raster is distorted
only in some
resolutions
1 Check for supported resolutions in the Specifications chapter.
2 Reboot computer and click Factory Settings button in
Monitors & Sound control panel (see Adjustments chapter).
3 Replace main deflection board. Then adjust the display (see
“Adjusting the Display after Replacing the Main Deflection
Board” in this chapter).
4 Replace CRT/video board only if the service strategy in your
region supports CRT/video board replacement.
5 US only: Call Apple Technical Support at 1-800-919-2775.