Horizontal Blue/White lines

I have read lots about Vertical lines on G5s but little about my newly discovered problem
I have a G5 fully updated 10.5.6- 1.9 GHz 1.5 GB mem. Horizontal Blue/White lines have appeared in columns about 25mm wide, all over the screen.
As I type they seem to go all fuzzy and change to a darker blue - I find this very distracting but so far I am able to use my machine with not too much difficulty, except that the fault doesn't help when I need to use my Photoshop software, inasmuch that the blue/white lines seem to dominate the background of the photos.
Has anyone got any ideas?
wtr

Same problem, different orientation.
This happens if your inverter cable gets damaged, or your inverter board gets shorted. Take it in for service.

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Horizontal Blue/White lines

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