The screen on my G4 has a vertical line that doesn't go away

My G4 Macbook has a Vertical Line on the lower screen that is about 3 inches high.  It doesn't go away.  What to do??

There is no such thing as a G4 Macbook. Macbooks have only had Intel processors.
However, wether you have a G4 notebook or an Intel notebook, I would want to run the Apple hardware test to check the video circuitry.  Find the original OS X disks that shipped with the system, and find the one that, in small print, says 'AHT Version x.x' on the label. Insert and reboot holding the alt/option key down. Choose the Apple hardware test, and when prompted choose the extended test. If you have either of the TechTool programs they can do similar testing. Does that point out any video issues?

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