Strange lines on the 24 Imac screen (white ones)

Hello folks, once in a while in my mac I am getting these lines in different locations on the screen. Sometimes they are bigger and sometimes they are smaller. They tend to go away if I close the window etc. I have made hardware test but there was no problem.
To see the jpg please take a look at the image linked below. The line is pointed with an red arrow.
http://www.bigfikir.com/sample.jpg
Specs
Model Name: iMac
Model Identifier: iMac6,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.16 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: IM61.0093.B07
SMC Version: 1.10f2
OS: Leopard 10.5.6
I would appreciate some feedback.

Welcome to the club,
a lot of iMacs late 2006 suffers from this issue. Permament cure is replacement of mainboard, temporary use an iMac Fan Control. Also a disabling of Quartz Extreme do a great job.
Search for "horizontal lines" and "iMac freezes" in Apple forum for more details
Apple! Here's another failed iMac! Do you hear that?
I doubt.
icg

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