Flashing monitor in my Macbook

Hi there,
My Macbook has a problem recently. The monitor flahsed several times these days when I was using it. Basically the monitor was blank for a few seconds and then return to normal afterwards and it happened several times already. Anyone got the same problem? What might be the cause for that?

I'm having a similar problem. For me the brightness of the screen sort of waivers every now and again (and I did just update Java and Safari).

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