Can you advise as to display craziness?

I have a what seems to me to be a very weird display issue. From time to time the screen gets a yellowish/green overcast, broken up looking somewhat like highspeed computer screens we seeing ticking off information in scifi movies. While this is going on any program displays when dragged around leave a ghost image behind.
The computer continues to work fine and sometimes it just clears up by shutting down a program, sometimes doing a restart, sometimes a restart doesn't help. It has been going on for quite a while and I can not find any regularity to it at all, no sequence of events, no programs that trigger it.
It may happen several times in one day and it may not happen for 3 weeks.
If connected to another dispaly the problem will show up there as well.
I have a screen shot of the issue but don't see a way to attach it here.
Thanks for any help.
Skip Nall
Power Book G4 and MAC PRO   Mac OS X (10.4.8)  

here is a link to a screenshot of the display when it is whacked out...since the day I shot that it has not been an issue...
http://viewmorepics.myspace.com/index.cfm?fuseaction=viewImage&friendID=92020261 &albumID=0&imageID=4516582

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