24" Imac Horizontal Video Lines Video tearing

My 24" Intel Imac 216 GZ Core 2 Duo 3g ram is suffering from video anomalies (thin horizontal noise lines, Tear lines and moving windows leaves trailing repeats of the window.) Lines occur as early as the desktop at startup. Using Itunes or mail aggrevates the problem. Safe Boot cures the problem, new partition does not. Apple Hardware Extended Test is negative. Repaired Disk & Permissions, reset Pram, Archive and install all with no results. Started as a minor issue mostly in mail but now happens with no programs running. Looking for ideas.
Thank You
Andy
Message was edited by: AndyNH

If you haven't tried yet, install SMCFanControl (and some other utility to show you the temperature readings for the different sensors inside your iMac) and push up your fan speeds with SMCFanControl to drive down the temperatures. See if you get no (or fewer) horizontal lines when your machine - particularly the graphics chip parts - is cooler, and more when it is hotter.
That isn't a remedy of course, and it seems from these various threads that the failure of your graphics chip is inevitable if you are having the symptom that it is heat related (ie that running the fans faster makes it stop happening, or happen less).

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24" Imac Horizontal Video Lines Video tearing

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