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I have a 20" Mac from mid 2007 and a week ago the screen has started to flicker. The picture isn't broken at all like some of the 27" models have had, seen and read all about that.
It's as if the brightness is continually changing from darker to lighter resulting in a flickering effect. I have tried recallibrating the screen which didn't help. A restart often helps but then it comes back after 15 minutes making me think it must be a software issue. Last update installed was an Apple security update last month but further than that nothing.

Any suggestions? I'm gutted as it's been fabulous until now.

Thanks engree.