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Jul 5, 2015 7:16 AM in response to Johnny Wellsby Allan Jones,Vertical lines are almost always a hardware issue and a symptom of a defective display. Please confirm which PowerBook model you have; some have known display issues. If your serial number starts with "W8" there is a strong possibility you are among many users whose computers were fitted with a bad display at the factory.
If you still think it is a software issue, try a safe boot (hold SHIFT key down during boot under you get a usable desktop or a message that you are in safe mode).