24" video will pixelate and eventually freeze and has to be powered down by holding power button

I have a 24" intel based imac 2006 model- Recently it has begun to show pixel blocks on the screen and will eventually lock up and has to be powered down by holding the power button.

Is this limited to the time you are using specific programs or does it happen regardless of what program you run?
It could be heat-related. Beofre incurring the expesnce of a new logic board, make sure the vent on teh bottom of the comptuer oare unobstructed by paper's etc on your workstation or by lint and dust. You canvacuum off any ling and get more cool air into the vents.
You may want to get a program like this:
http://bresink.com/osx/TemperatureMonitor.html
to monitor and report your temperatures here.

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