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Troubleshooting Symptom Charts/Video - 13
Thin white line is
always on at middle of
screen
1 Change the desktop pattern; if the line remains, replace display.
An external monitor
connected to the
PowerBook shows no
video
1 Verify cable and cable connections between monitor and video
board.
An external monitor
connected to the
PowerBook shows
either horizontal or
vertical rolling, or
horizontal or vertical
distortion
1 Verify monitor using another computer.
2 Replace logic board.