Verical lines in the LCD
Are vertical lines (dead pixels) in my LCD display caused by a bad CCFT tube or something within the LCD glass panes?
provides light for contrast... like a flood light. Bad pixels could be either the screen, if one or two pixels or a single row.
If there are multiple rows (especially with the known issues of G4 GPUs) I'd suspect the video chip.
Connect the laptop to an external display.
If the lines go away it's the LCD if they stay it's the GPU.
If this answer is acceptable please return and mark it.