My computer screen keeps flikering

my screen keeps flasing in every 2 secoonds, happens even on startups and when i turn off my computer!!! can someone pls help me and my resolution is 1440*900,and refresh rate is 60.. thats the only option.

OK that sound like the video card and in the case of an Macbook, that site on the mother board. This will possible mean you have to replace the whole mother board and that is pretty expensive if you don't have an Apple Care pack. back up and get to a service center asap. If it was just parts of a window the where breaking up when you drag a window around, then it could be the firmware and easily fixed.

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