Vertical green dots/lines

One of our 17" iMacs has started to display random greenish vertical lines made up of a series of pixel sized dots. I've reset NVRAM/PRAM without any change. The lines/dots appear on the login screen and continue for any login.
If I Safe Boot the dots disappear, so I think it must be software rather than hardware related. There are no external Firewire or USB devices connected (other than the keyboard and mouse).
Any ideas what might be causing this and how to fix it?
Thank you.
-Terry
17" G4 iMac, OS X 10.3.9, 512MB RAM

A good way to test this theory is to clone backup your data as my FAQ* explains:
http://www.macmaps.com/backup.html
And then erase and install the operating sytem.
If the issue persists with an erase and install, you have a hardware issue.
If the issue does not persist with an erase and install then your software data file had become corrupted.
* Links to my pages may give me compensation.

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