Anyone knows what to do with a flickering screen?

I have the white macbook, and lately my screen has been flickering a lot, for example when i have just turned on the computer or when it is loading a webpage or program. It doesn't turn black completely but it just goes from bright to dark and dark to bright and so on.
I was thinking about going back to the store, but since this problem doesn't occur EVERY time, it is kind of hard to proof.
has anyone else had this problem or does anyone know what i should do?

I've had this problem, and it's starting to get really frustrating. It's your backlight, and if you don't get it fixed, eventually the screen will go dark for good and you won't be able to see anything. What's frustrating is that I've had this problem repaired by Apple 3 TIMES in the past 10 months, and it's happening to me again. I'm about ready to chuck this machine out the window at the nearest Apple representative. I don't want to keep having it sent out every 3 months for repair.

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