Occasionally Scrambled Screen

Every few months, my monitor will become scrambled for no apparent reason. I've not noticed any pattern to when it will happen. To fix it, I have to sleep/wake the computer a few times. I've researched the repair extension program and I don't believe I'm covered. This iMac was purchased in Dec. 2005.
A screen grab of the scrambled screen is at this link.. http://farm3.static.flickr.com/2291/2477293588_d427e98d3f.jpg?v=0
If there's a way to embed the picture in my post, please let me know. If anyone has seen this issue before or knows a solution, PLEASE help me out!
Message was edited by: Sean Moody

India
"How do they (Apple) get to know which Mac's are having problems if there's no way of logging it with Apple?"
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Message was edited by: rc_sportpilot
Message was edited by: rc_sportpilot

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