Albook G4 Display Has White Bar Bottom Screen

Hello all:
My Albook G4 display has a white bar on the bottom third of the screen. Last year I followed these steps to fix tighten the hinges: http://macintoshhowto.com/hardware/how-to-fix-a-loose-hinge-on-an-aluminium-powe rbook.html
and I'm guessing I may have damaged, loosend or otherwise screwed up the connections. Any suggestions? TIA!

Thanks for your reply. Not quite sure when the issue started (my daughter's machine) but I think its been progressing for several months.
Before your reply, I was thinking hardware (monitor cable) but at your suggestion I ran TechTools - no issues. I also checked and repaired permissions, ran the fsck -fy in single user mode, and changed the desktop picture and screen saver options. It seemed to have cleared up, but when I adjust the screen position (open or close) the same area briefly acts up. I still think it may be a connector or cable issue, but there obviously was some sort of software issues too, so thanks for your suggestion. Is there a tutorial on how to check the screen connections that you would recommend? Thanks again!

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